Northstar 490 Echosounder
Northstar 490 Echosounder, size: 3.1 MB
Northstar 490 Echosounder Install Guide
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33-foot cable (part of transducer) 490 module
10-foot cable (Northstar-supplied)
Figure 1: 957/958 echo sounder system components
GPS antenna Control Head 33-foot cable (part of transducer) 490 module
Figure 2: 961/962 echo sounder system components
Powering the 490 on and off
As part of its power-up sequence, the navigator automatically activates the 490. The 490 is automatically shut off by the navigator when you press and hold PWR until the screen goes dark.
Setting up the 490
Your 490 should be installed by a qualified marine technician. Your satisfaction with the systems performance will be greatly influenced by the practical knowledge and experience of the installer. Unlike GPS or other marine electronics systems, echo sounder installation is as much an art as a science. The installation procedure includes setting up the following options: the transducers depth the speed and temperature Page 1-7
Chapter 1 - Welcome the calibration for the speed sensor the calibration for the temperature sensor the gain calibration for the transducer
You may wish to change the following options from time to time to match your personal preferences: depth units (feet, meters, or fathoms) on the screen temperature units (Celsius or Fahrenheit) on the screen temperature scale (lowest and highest) on the screen automatic saving of *FISH##* or *THERM##* waypoints when the 490 detects the presence of fish or a certain water temperature that youve set
To see or change any of the above settings, press STAR several times until you reach the ECHO SOUNDER SETUP screen. For details, see Setup functions starting on page 2-12.
Using the 961/962
Before starting, you should double-check that the 961/962s Port 3 is set to the 490 option: 1. Press STAR until you reach the SERVICE MENU screen. 2. Press PORT SETUP. 3. Press PORT 3. 4. Check that the FORMAT option is set to 490. If not, set it now.
Using the 957/958
Before starting, you should double-check that the 957/958s AUX port is set to the 490 option: 1. Press STAR until you reach the OPTIONS/SERVICE INFO screen. 2. Press the PORT SETUP OPTIONS key. 3. Check that the AUX PORT option is set to 490. If not, set it now.
Auto Picture Frequency Zoom Depth More
Depth settings More settings
Alarms Advance Speed Snapshot A-Scope Data Return
Shift Range Bottom box Return
Gain Clutter Noise Limiter Hue Signal level Return
Data on-screen Bottom box Temp box Temp graph Speed
Depth marker and indicator Water temperature box Color bar Water temperature scale Position marker and indicator Echo data Depth Scale
Lat/lon of position marker
Dist/brg to position marker
Figure 6: Illustrated SOUNDTRAC screen
All of the alarm messages always appear on all of the echo sounders screens. You wont miss any alarms while displaying echo sounding data, and you never have to press any keys to view the current alarms (although you must press STAR to clear alarms that dont automatically clear). The SAVE and MOB functions always work normally. Moreover, whenever you press either of these keys, the corresponding *SAVE##* or *MOB##* waypoints will be displayed automatically on the echo sounders picture, as well as on the CHART screen (after you press CHART).
Using demo mode
The echo sounder can be operated in demo mode for training and familiarization. Simulated echo data generated by the 490 will be displayed. To enter demo mode: 1. Press STAR several times to display the ECHO SOUNDER SETUP screen. 2. Press the CURSOR PAD down to select demo mode, then press EDIT. 3. Press the CURSOR PAD left or right to highlight ON, then press ACCEPT.
While in demo mode, the word Demo appears in the upper right corner of the ECHO screen.
To leave demo mode, repeat this procedure, selecting OFF instead of ON.
Displaying echo sounder data on the CHART screen For the 961/962
You can overlay a smaller version of the echo screen onto the CHART screen.
To overlay the echo screen: 1. Press CHART to display the CHART screen, then press OVERLAY. 2. At the CHART OVERLAY SELECTION window, press SHOW 490.
Both chart views A and B will display live echo sounder data on the right-hand side of the screen.
3. To remove echo sounder data, press HIDE 490 on the CHART OVERLAY screen.
For the 957/958
To overlay the echo screen: 1. Press CHART to display the CHART screen, then press SOUNDER. The CHART screen will display live echo sounder data on the right-hand side of the screen.
Cruising or fishing
Automatic mode has two variations: autocruising and autofishing. autocruising optimizes the gain and clutter for tracking the bottom, with less emphasis on any fish in the water autofishing optimizes the gain and clutter for searching for fish
Press AUTO to switch between autocruising and autofishing. The colored tab below the menu key indicates whether the unit is optimized for cruising or fishing.
The status tabs
Colored status tabs just below the AUTO and PICTURE keys are green when the echo sounder is operating fully automatically. They turn yellow when any of the settings has been set manually. (In some cases, the picture tab may be yellow while the auto tab is still green, if the Noise Limiter is turned on, for example.)
Manually overriding automatic mode
You can always manually change any of the echo sounders settings: the gain, clutter, noise limiter, shift, and range. (Manually setting the gain causes the range to be controlled manually.) Changing the appearance of the picture (colors, gain, clutter, and the noise limiter) is described in Chapter 3. Setting the range and shift is described in Chapter 6.
Changing the frequency of echoes
The 490 uses two transducer frequencies: 50 kHz and 200 kHz. The advantages and disadvantages of each frequency are shown below.
Table 2: 50 kHz vs. 200 kHz
Longer wavelength goes deeper, but with somewhat lower resolution. Less resolution is better at finding big fish, but may miss the bait fish. Wider beam is good for seeing fish not directly beneath the boat.
Shorter wavelength provides a sharper picture, but cant go as deep. Finer resolution is better at finding small fish (baitfish) and subtle bottom details. Narrower beam is very focused. Reduces the influence of a rough sea.
You can choose from four settings for the transducer frequency: 50 kHz displayed on a full screen 200 kHz displayed on a full screen 50 kHz on the left half of the screen, and 200 on the right 200 kHz on the left half of the screen, and 50 on the right
There are two reasons why you might want to operate with your preferred frequency on the right side of the screen:
Chapter 2 - Quick Start: Using the Echo Sounder the zoom function magnifies the frequency on the right side when adjusting the picture, you can see the effect of changes on the right side
200 kHz echoes
50 kHz echoes
Adjusts the frequency of the data displayed (currently showing dual frequency on a split screen, with 50 kHz to the left and 200 kHz to the right)
Figure 7: ECHO screen with both frequencies displayed
To change the display frequency: 1. On the ECHO screen, press FREQUENCY until you display the desired frequency or frequencies.
The frequencies in use are shown pictorially on the tab just below the FREQUENCY key.
When you change the frequency, echoes already on the screen dont change, they just move off the screen as they are replaced by echoes at the new frequency. A dual-frequency screen is split into two halves separated by a gray vertical line in the center. Page 2-Echo Sounder Operations Manual Rev. B2
Chapter 2 - Quick Start: Using the Echo Sounder When using the zoom feature (which also splits the screen into halves), both sides of the screen always display the same frequency.
Zooming in and out
On the ECHO screen, the echo sounders zoom feature expands a portion of the echoes. You can examine closely any part of the water column, to determine the composition of the bottom or look at the echoes of fish, rocks, or wrecks. When fishing, the zoom function is useful for showing a detailed view of any echoes below the vessel.
Choosing the zoom scale
Press IN to zoom in and increase the magnification of the echoes you see below the top edge of the marker. Press OUT to zoom out and increase the amount of water seen. You can choose from any of six depth scales for the magnified echoes. These scales cover the same depths regardless of the scale of the original echoes. The available scales are: 15, 30, 60, 120, 240 and 480 when using units of feet. Similar scales are available for the other depth units.
When zoom is in use, only a single frequency is displayed. Unzoomed echoes are on the right, and the same frequency is shown magnified on the left. Whatever frequency was previously shown on the left is replaced by a magnified view of the right side.
You cannot zoom out to a scale that shows more water than the original picture. For example, if the original picture is set to a scale of 50, the only zoom scales available will be 15 and 30.
Choosing a zoom mode
Press ZOOM on the ECHO screen to cycle through the four zoom modes (and choose the one you want): bottom zoom bottom lock bottom lock/center Page 2-9
The line *Fish##*: controls fish waypoints The line *Therm##*: controls temperature waypoints The line Mark Wpts: controls waypoints marked by the user
2. Press EDIT. 3. Press the CURSOR PAD left or right to highlight the desired number of waypoints to be saved. 4. Press ACCEPT.
Speed and temperature sensor setup
These functions are set during installation. The calibrations should not be changed unless they are known to need adjustment. From the ECHO SOUNDER SETUP screen, press SPEED/TEMP to access the SENSOR SETUP screen.
961/962 sensor setup screen
957/958 sensor setup screen
To simplify operation, the sensor installed options can be set to No to remove all references to temperature and speed from all the screens. Highlight the appropriate line and press EDIT to change an option. Speed calibration is entered as a percentage from 99% to +99% to make the speed read lower or higher than the uncalibrated value.
You must enable the speed setting under the Data menu on the ECHO SOUNDER screen; see Setting the ECHO screen data starting on page 5-4.
Temperature is calibrated by entering the temperature error as a number of degrees from 99 to +99. This offset is added to the uncalibrated temperatures before they are displayed or graphed.
Adjusting the Echo Sounder Picture
The picture menu. 3-2 Adjusting the gain (strong echoes). 3-2 Adjusting the clutter (weak echoes). 3-3 Adjusting the signal level (weak echoes). 3-4 Suppressing interference (the noise limiter) 3-5 Selecting the color bar (hue) and white level 3-6
his chapter explains the different ways you can adjust the echo sounders picture, including gain, clutter, the noise limiter, white level, and signal level.
Chapter 3 - Adjusting the Echo Sounder Picture
The picture menu
You can adjust the appearance of echoes in five different ways: gain (for high intensity echoes) clutter (for low intensity echoes) noise limiter (for interference) hue (to choose colors and white level) signal level (to remove weak echoes)
Gain and clutter changes are applied only to new echoes as they appear on the right side of the screenearlier echoes are not affected.
When you override the gains automatic settings, the tabs on the PICTURE key and AUTO key change from green to yellow, indicating the system is no longer in automatic mode. When you turn the noise limiter on, only the PICTURE key tab changes from green to yellow. Changing the hue or adjusting the signal level has no effect on the operating mode (the tabs stay green).
When you adjust the clutter, the color of the AUTO and PICTURE key tabs changes from green to yellow, since the echo sounder is no longer in fully automatic mode.
Adjusting the signal level (weak echoes)
As with the CLUTTER key, the SIGNAL LEVEL key controls the appearance of low level noise in the picture. Whereas clutter compresses or expands the available colors to fit the Page 3-Echo Sounder Operations Manual Rev. B2
Chapter 3 - Adjusting the Echo Sounder Picture desired signal range, Signal Level completely removes the weaker colors and their echoes. To adjust the signal level: 1. On the ECHO screen, press PICTURE. 2. On the PICTURE screen, press SIGNAL LEVEL. 3. At the SIGNAL LEVEL window, press the CURSOR PAD up or down to remove the weaker color levels from the picture, or use the KEYPAD to manually enter the desired signal level. The available settings range from 1 (minimum) to 5 (maximum). For example, if you select a signal level of 3, echo strengths of 0 through 3 are all displayed using the same color. 4. Press RETURN to go back to the ECHO screen.
Suppressing interference (the noise limiter)
The noise limiter reduces the adverse effects of interference from other nearby echo sounders or electronic devices. however, the noise limiter may cause some very weak echoes to be made smaller or entirely eliminated, since it removes any echoes that arent sustained for at least two pings. To turn on the noise limiter: 1. At the ECHO screen, press PICTURE. 2. At the PICTURE screen, press NOISE LIMITER. 3. At the NOISE LIMITER window, press the CURSOR PAD up to turn the noise limiter on (or press NOISE LIMITER again). 4. Press the RETURN key to go back to the ECHO screen.
Turning the noise limiter on changes a portion of the PICTURE key tab from green to yellow, as a reminder.
Selecting the color bar (hue) and white level
Understanding the color bar
The color bar displayed at the extreme left of the ECHO screen shows the range of colors used to display different echo strengths. Weaker echoes are displayed with colors near the bottom of the scale, and stronger echoes are displayed with colors near the top. You can choose any one of nine palettes of colors to represent the echo strengths from weakest to strongest. Color bar #1 is the one most often used. Color bar #2 is similar but with fewer colors, to aid visibility under some conditions. Color bars # 3-8 are additional variations with different background colors. Color bar #9 uses only a single color, ranging from very dark to very bright.
Selecting the color bar (hue)
To select the color bar: 1. On the ECHO screen, press PICTURE. 2. Press HUE. 3. At the HUE AND WHITE LEVEL window, press the CURSOR PAD left or right to select the color bar desired, or use the KEYPAD to manually enter the number of the color bar.
Hue and white level window
Setting the white level
You can replace any single color in the color bar with white. On the HUE AND WHITE LEVEL window, press the CURSOR PAD up or down to select that color. To remove the white level and return to using all the colors on the color bar, press the CURSOR PAD down until the white level moves off the color bar.
Understanding Depth Settings
Viewing the seabed depth. 4-2 Viewing the depth marker. 4-2 Changing the depth settings. 4-2 Setting the pictures shift (starting depth). 4-3 Setting the pictures range. 4-4
his chapter explains how to override the systems automatic depth settings and manually control the depth range shown on the screen, and how to use the depth marker.
Chapter 4 - Understanding Depth Settings
Viewing the seabed depth
The seabed depth (the bottom) is displayed in a black box at the left edge of the ECHO screen. You can change the size and location of the depth box on the ECHO screen. Its size on the SOUNDTRAC screen is always small. There are four available sizes: small medium large huge
To resize the depth box or move it up or down: 1. At the ECHO screen, press DEPTH. 2. To cycle through the size choices, repeatedly press BOTTOM BOX. To move the box up and down, press the CURSOR PAD. 3. Press RETURN to go back to the ECHO screen. The depth box can also be adjusted by pressing MORE, then pressing DATA.
Viewing the depth marker
You can use the depth marker to accurately measure the depth of an echo. To display the depth markera dashed horizontal lineand move this marker up or down, press the CURSOR PAD down. Attached to the depth marker line is a small black box, which displays the markers exact depth. The depth marker also affects the display in Marker Zoom mode.
Changing the depth settings
You can adjust the shallowest and deepest echoes to be shown on the ECHO screen. In automatic mode, the echo sounder sets these values based on its current environment. However, Page 4-Echo Sounder Operations Manual Rev. B2
Chapter 4 - Understanding Depth Settings you can manually override these auto values for your specific needs at any time. There are two depth settings: shift (how far below the surface the echo sounder picture starts) range (the depth covered by the echo sounder picture from the top of the screen to the bottom of the screen)
Setting the pictures shift (starting depth)
The shift setting adjusts the depth of the top edge of echoes pictured on the ECHO screen. You can shift the entire picture up and down to start at the surface of the water, or any other depth you choose. To shift the picture: 1. At the ECHO screen, press DEPTH. 2. Press SHIFT.
Using the MORE key
Pressing the MORE key accesses the following functions: alarms (described in Chapter 7) advance speed A-scope data (numeric and graphic information on the ECHO screen) snapshots (961/962 only) video overlay setup (957/958 only)
When the menu function is in use, the ECHO screen moves every half second, giving the picture a less than smooth appearance. Press RETURN to go back to the main screen for a normal smooth appearance.
Changing the advance speed
Advance speed refers to the speed at which the vertical scan lines move from right to left across the ECHO screen. There are five advance speeds (plus the STOP setting, which freezes the advance of all data):
2/1 - two identical lines of data are displayed for every ping 1/1 - one line of data is displayed for every ping 1/2 - one line of data is displayed for every two pings 1/4 - one line of data is displayed for every four pings 1/8 - one line of data is displayed for every eight pings
For speeds 1/2, 1/4, and 1/8, each displayed line of data is averaged over 2, 4, or 8 pings.
To set the advance speed: 1. At the ECHO screen, press MORE, then press ADVANCE SPD. 2. At the SET ADVANCE SPEED window, keep pressing the ADVANCE SPD key to select the desired advance speed. 3. Press RETURN to go back to the ECHO screen. Page 5-Echo Sounder Operations Manual Rev. B2
Displaying the A-scope
The echo sounders A-scope lets you look closely at present or past echoes by horizontally magnifying the echo from each ping. To display the A-scope: 1. Press MORE. 2. Press A-SCOPE to turn the A-Scope on or off.
A-scope on single-frequency echo screen The A-scope appears on the far right-hand side of the screen, magnifying the water column designated by the position marker.
Using the A-scope with dual frequencies
If youre displaying both 50 and 200 kHz echoes, the A-scope magnifies echoes from the frequency shown on the right side of the screen.
A-scope on dual-frequency echo screen
Using the A-scope with zoom mode
If youre in zoom mode, the A-scope magnifies the unzoomed echoes on the right side of the screen.
Setting the ECHO screen data
Screen data refers to numeric and graphic information displayed on top of the echoes, including bottom depth, water temperature, and speed through the water (STW). To access these functions, press MORE, and then DATA.
Echo screen data selections
Bottom depth box
Press BOTTOM BOX to set the size and location of the box displaying the bottom depth (white numbers on a black background). Press this key again to cycle through the available sizes: small, medium, large, and huge. Press the CURSOR PAD up and down to set the position of the box at the left edge of the screen.
Archiving and restoring snapshots with a Zip disk
If your 961/962 has a zip drive installed, you can save up to 10 snapshots on each disk. To save a stored snapshot onto a zip disk, from the SNAPSHOT screen, press the CURSOR PAD to highlight the desired slot, and press ARCHIVE. A new screen appears displaying the 10 slots available on the zip disk.
Archiving snapshots screen (961/962 only)
Press the CURSOR PAD to select an empty slot on the disk, and press OK. The snapshot will be written to that slot on the zip disk. To restore a snapshot from a zip disk to any empty slot, from the SNAPSHOT screen, press the CURSOR PAD to highlight the desired empty slot, and press RESTORE. A new screen appears displaying the 10 slots on the zip disk. Use the CURSOR PAD to select the slot containing the snapshot you want to restore, and press OK.
Setting up the video image overlay
If youve connected the 957/958 to an NTSC-compatible device, you can display the image on the echo sounder screen. To display the video image on the ECHO SOUNDER screen, first press MORE, then press VIDEO. To change the transparency of the image while youre displaying the ECHO SOUNDER screen, go to a different screen, press the IN or OUT keys, then return to the ECHO SOUNDER screen. To change the size and placement of the image on the ECHO SOUNDER screen, press the STAR key to display the VIDEO SETUP screen, then follow the instructions on the screen.
Reviewing past echoes using SoundTrac
Viewing past echoes using SoundTrac. 6-2 Marking fish as waypoints. 6-3 Navigating to a past echo position. 6-3
his chapter describes how to use SoundTrac to view past echoes, and how to navigate to any past echo positions.
Chapter 6 - Reviewing past echoes using SoundTrac
Viewing past echoes using SoundTrac
On the SOUNDTRAC screen, you can use Northstars exclusive SoundTrac feature to look back and examine past echo data. To enable SoundTrac, at the ECHO screen, press the CURSOR PAD to the left. A dashed vertical linecalled the position markeris now displayed.
Echoes from at least the past three minutes are available, depending on the depth of the water and the advance speed youve set.
To move back to echoes that were displayed within the past few minutes, continue pressing and holding the CURSOR PAD to the left.
As you move the position marker with the CURSOR PAD, the marker speed accelerates to quickly scroll to the desired location.
The lat/lon of the position marker is displayed at the bottom of the picture, along with the time elapsed since the ping, and the distance and bearing from your present position to the marker (assuming the navigator is providing position data.) As you move the position marker left and right, these coordinates change accordingly.
When you use the position marker on a split screen (showing either two frequencies, or zoom mode), each half of the screen has a position marker. Both markers designate the same physical location.
Chapter 6 - Reviewing past echoes using SoundTrac Echoes from the last 3000 pings are stored. If you try to move the position marker beyond the oldest echoes stored, an alert is sounded. The number of minutes of past echo data available depends on two factors: the depth of the water the advance speed
In deeper water, the 490 pings at a slower rate, so the echo sounder saves data over a longer period of time. A slower advance speed will have the same effect.
Marking fish as waypoints
The fish marking function lets you use SoundTrac to mark fish, wrecks, or any other objects that you see at any past echo displayed on the screen. To mark echoes as waypoints: 1. At the ECHO screen, press the CURSOR PAD to the left to move the position markera dashed vertical lineto the position of the echo. 2. Press MARK.
A *MARK##* waypoint immediately appears on the SOUNDTRAC screen and on the CHART screen. Each marked echo becomes a waypoint (named *MARK##*) stored in the waypoint database. You can perform all of the usual waypoint functions, including going directly to this waypoint, adding it to the end of your trip, changing its name, etc.
Navigating to a past echo position
On the SOUNDTRAC screen, the GO TO function can be used for any of the following functions: to go directly to a past echo position to add a past echo position to the end of your trip to store a past echo position as a waypoint or avoidance point Page 6-3
Chapter 6 - Reviewing past echoes using SoundTrac to make a new route with a past echo position as its first waypoint to add a past echo position to the end of an already displayed route
Going to a past echo position is described below. The other options are described in the Northstar 961/962 Operations and Reference Manual and the Northstar 957 Operators Manual or Northstar 958 Operators Manual.
Going directly to a past echo position
To go directly to a past echo position (as long as the GPS is providing position data): 1. On the SOUNDTRAC screen, press the CURSOR PAD left or right to move the position marker to the desired position, then press GO TO.
The SELECTED CURSOR POSITION window appears.
2. Press GO NOW.
The navigator creates a new temporary waypoint called COORD and returns to the SOUNDTRAC screen. The COORD waypoint isnt stored in the waypoint database; instead, its placed in the trip, where it replaces any future trip points. To see this current waypoint on the CHART screen, press CHART at any time. Your present vessel position and time have now become a past trip point.
Bottom alarm window
Setting the bottom level
You can set the depth level for the seabed, so that as soon as the bottom is shallower than this depth, the bottom alarm will sound. To set the bottom level, at the BOTTOM ALARM window, press the CURSOR PAD up or down to set the depth, or use the KEYPAD to manually enter the desired depth.
The 490s depth indicator reflects the depth below your vessels transducer, not below the keel. Ask your installer for the exact distance between your transducer and your keel. This value must then always be manually added to the 490s depth indicator, or else entered into the transducers depth setting on the ECHO SOUNDER SETUP screen for an automatically correct reading.
Turning the bottom alarm on and off The alarm
To turn the alarm on, at the BOTTOM ALARM window, press TURN ALARM ON. To turn the alarm off, press TURN ALARM OFF. When the bottom is detected, the alert tone sounds and the message Bottom Collision! is displayed at the bottom of the screen. This message clears automatically after 20 seconds, and the alarm is reset.
Setting the temperature alarm
This alarm isnt present unless a temperature sensor is installed and configured.
When the temperature alarm is set, an alarm sounds if the echo sounder detects that the water temperature has either risen above or dropped below the limit youve set. To set the temperature alarm: 1. At the ECHO screen, press MORE. 2. Press ALARM. 3. At the ALARM screen, press TEMP ALARM.
The options on the TEMPERATURE ALARM window are on/off, upper and lower limits, and inside or outside limits.
Temperature alarm window
Setting the upper and lower temperature limits
You can set the upper and lower temperature limits. When the water temperature is either inside or outside these limits, the temperature alarm will sound. To set the upper temperature limit: 1. At the TEMPERATURE ALARM window, press SET UPPER LIMIT.
The upper limit window is highlighted in black.
2. Press the CURSOR PAD up or down to set the temperature, or use the KEYPAD to manually enter the desired temperature.
The temperature is displayed in the tab just below the SET UPPER LIMIT key.
To set the lower temperature limit: 1. At the TEMPERATURE ALARM window, press SET LOWER LIMIT.
Connects Northstar 961/962 GPS Chart Navigator Northstar 957/958 GPS Chart Navigator Northstar-recommended or compatible transducer Transducer outputs protected against open circuit/ short circuit LED monitors input power and system status
Dimensions Weight 10 x 6.25 x 2.5 inches 2 pounds
Temperature Protection Standards -25C to +60C operating temperature -55C to +90C storage temperature 10 to 30 VDC, 8 Watts, reverse polarity and overvoltage protection Waterproof design meets the following: IEC60529 IP6; IEC60945 emissions; CE mark
Gain Clutter Signal level Noise limiter White level Other 0 to 75 db 0 to to 5 ON/OFF Any single color Screen color palette Depth marker Position marker Zoom in/out Shift 15, 30, 60, 120, 200, 400, 800, 1000, 2400 feet 5, 10, 20, 40, 80, 150, 300, 500, 800 meters 1/8 to 2/1 Feet, meters, fathoms Include speed, temperature, gain, and transducer type
Ranges Advance speed Depth units Installation calibrations
A-scope COG A horizontally magnified view of each echo, where the strength is shown by the width as well as the color of the line. Course-Over-Ground. The actual path of your vessel relative to the surface of the earth. Distracting echoes caused by turbulence, plankton, etc. Can be reduced by the clutter control. The horizontal movement of water caused by tidal or other forces. A choice made automatically by the echo sounder; some defaults can be overridden in partial automatic mode. The sound returned by either an object below the waters surface or by the seabed, when this object or seabed is detected by a sound wave. An instrument that uses sound waves to measure the depth of a body of water or an object (such as a school of fish) below the waters surface. A depth measurement that equals six feet or 1.83 meters of water. The amount of amplification given to the received echo before it is displayed. Global Positioning System. The gradations of a color. The electromagnetic interruption of a radio signal that causes a poor signal reception. Interference may originate from external sources, such as another nearby echo sounder, or from the vessel itself, such as alternator noise. Imaginary lines on the earth's surface running East/West and expressed in degrees (0-90) north or south of the Equator. Used in conjunction with the North/South lines of longitude to determine position. Imaginary lines on the Earth's surface running North/South and expressed in degrees (0-180) east or west of the Prime Page B-1
clutter current default echo
fathom gain GPS hue interference
Appendix B - Glossary Meridian (a line running from the North to South Pole, passing through Greenwich, England). meter nautical mile (nm) A unit of measurement (length) equal to 39.37 inches, slightly more than a standard yard. An international unit equal to 6,076.115 feet (1,852 meters) used officially in the U.S. since 1959. A nautical mile is about 800 feet more than a statute mile. One nm is equal to 1 minute of latitude. A pulse transmitted from the 490 echo sounder. Also, the act of transmitting a pulse from the echo sounder ("pinging"). Speed Over Ground. The actual speed of your vessel relative to the earth, not the water. The vertical rise and fall of water caused by the gravitational pull of the moon and sun. The device mounted through the hull to send and receive ultrasonic beams that determine seabed conditions and locate fish. A particular location, saved by marking fish on the echo sounders LIVE-DATA screen, which is used as an intermediate or final destination.
490 ECHO SOUNDER
Rev B2 Part Number GM491 Northstar Technologies 30 Sudbury Road Acton, Massachusetts 01720 www.NorthstarNav.com Service: 978/897-0770 Sales: 978/897-6600
Limited warranty policy
Northstar Technologies, Inc., warrants the Northstar 490 to be free from defects in materials and workmanship for a period of two (2) years. This warranty applies to the original purchaser and to any subsequent owner during the warranty period, which begins on the date of shipment of the unit, F.O.B. Acton, Massachusetts, to an authorized Northstar dealer. Systems may not be returned to Northstar without a Returned Materials Authorization (RMA) number. Call the Northstar dealer or Northstar for instructions. During the units warranty period, Northstar will repair or replace, at its option, any part of the unit it finds to be defective due to faulty material(s) or workmanship. All such repairs and/or replacements will be promptly performed by Northstar free-of-charge to the owner, excluding freight costs incurred in shipping to the factory. Return shipments from Northstar to points within the United States are made via ground transportation, freight prepaid. Special shipping charges (overnight, two-day, and so on) are the responsibility of the owner. To be covered by this warranty, the Northstar equipment must have been in normal use. This warranty does not apply to units with defects caused by improper installation, physical damage, abuse, tampering, lightning or other abnormal electrical discharge, or to units with defaced or altered serial numbers, or to units repaired by unauthorized persons or repaired in a manner that violates Northstars recommended service procedures. All repairs and/or replacements made under this warranty must be performed at Northstars facilities in Acton, Massachusetts. Performance of warranty work elsewhere will not be authorized, and Northstar will not pay for any charges for such work. Northstar will not be responsible for payment of any charges imposed by a Northstar dealer or other party for services requested by and/or performed for a units owner in connection with this warranty. Such services might include removal of the unit from a vessel, inspection, packaging, handling, reinstallation, and the like. Northstar Technologies assumes no responsibility for any consequential losses of any nature with respect to any of its products or services sold, rendered, or delivered. The foregoing is the only warranty expressed or implied. No other warranty exists.
Table of Contents
SECTION ONE Introduction.1 Welcome to the Northstar 490. Who should read this manual. Scope of this manual. Installation considerations.18.104.22.168
SECTION TWO Installing the transducer.5 Safety considerations. Selecting a transducer. Installation considerations. Choosing a mounting location. Installing a transducer. Maintaining a transducer.22.214.171.124.10.11
SECTION THREE Installing the 490. 13 Safety considerations.13 System components.14 Choosing a mounting location.15 Mounting the 490.16 Wiring the 490.17 Powering up, setting up, and powering down the 490.21 Installation-test checklist.22 SECTION FOUR Troubleshooting and servicing the 490. 23 Troubleshooting common 490 installation problems.23 Getting technical support.26 Ordering replacement parts.27 Servicing the 490.27 Returning a 490 for service.28 APPENDIX A Technical specifications. 29 Glossary. 31
490 INSTALLATION MANUAL, Revision B2
SECTION ONE Introduction
Welcome to the Northstar 490
An echo sounder is a device that provides information about the water directly beneath a vessel. The echo sounder system consists of:
the Northstar 490 echo sounder sensor a Northstar navigation system such as the 961/962 or 957/ 958 a transducer
The 490 is available in two models:
the model 490-D is a 1000-watt dual channel echo sounder designed to be used with a transducer having dual ceramic elements, one each for 50 and 200 kHz the model 490-S is a 600-watt single channel echo sounder designed to be used with a transducer having a single ceramic element capable of 50 and 200 kHz
In this manual, the term 490 refers to both models. For more information about the 490-D and 490-S, see System components on page 14.
Who should read this manual
This manual is for marine technicians who are installing the Northstar 490 and connecting it with the Northstar 961/962 processor or Northstar 957/958, and a transducer.
Scope of this manual
In this manual, youll find information about the following:
mounting and wiring the 490 connecting the 490 to the Northstar 961/962 or 957/958 installing a transducer (an overview is provided, but for such details as wiring, see the documentation provided by the transducers manufacturer) connecting the 490 to a transducer (see also the Transducer Connector InstructionsGM492) troubleshooting and testing the system technical specifications for the 490
For information about obtaining technical support and returning the 490 for factory service, see SECTION FOUR Troubleshooting and servicing the 490 beginning on page 23. For details about operating the 490 using the 961/962 or 957/ 958, see the Northstar 490 Echo Sounder Operations Manual (GM490).
The following list of installation considerations isnt a substitute for all the details in Section Three. To ensure that you meet all critical installation parameters, be sure to read that entire section and follow all of its recommendations.
Check the shipping carton for any damage, and immediately report any damage to the carrier. Save all packing material in case you have to return the 490 to the factory for repair or evaluation. Unpack the carton, and check its contents. You should have received:
the Northstar 490 Echo Sounder (-D or -S model) 10-foot (3-meter) data cable to connect the 490 to the 961/962 or 957/958 10-foot (3-meter) power cable for the parts kit (containing transducer cable end connector, backshell, heatshrink tubing, and the Transducer Connector InstructionsGM492) Northstar 490 Echo Sounder Installation Manual (GM491) Northstar 490 Echo Sounder Operations Manual (GM490) warranty card
3. 4. 5.
Fill out the warranty card and mail it to Northstar. Review all of the installation requirements as outlined in Sections Two and Three. Install the transducer, then terminate the cable (see Connecting the 490 to a transducer starting on page 20). Mount the 490. For instructions, see Mounting the 490 on page 16. Connect the 490 to ships power and to the 961/962 processor or the 957/958. Connection information begins on page 17.
With the vessel in the water, turn on the system and verify proper operation.
SECTION TWO Installing the transducer
Be sure to turn the power off before starting the installation. Further, it is highly recommended that you keep power off while youre performing the installation. If power is left on or turned on during the installation, fire, electrical shock, or other serious injury may occur. Be sure to ground the equipment to prevent electrical shock and mutual interference. Be sure the transducer outputs are tied together before handling to avoid electrical charge build-up.
Be sure to use a 3-amp fuse. Using the incorrect fuse can result in fire or damage to the 490.
Mounting the transducer requires drilling holes through the hull; make sure the installation does not cause the vessel to leak. A thru-hull installation should be performed by a professional installer. Do not attempt this unless you are fully qualified. Do not perform a thru-hull installation of the transducer when the vessel is actually in the water. Immediately after installing the transducer, be sure to check for leaks, and dont leave the vessel in the water for more than three hours before checking it again. Northstar assumes no responsibility for improper installation of a transducer.
Be sure that the transducer doesnt interfere with any of the on-board systems. Check all other systems to ensure that their performance doesnt degrade when the transducer is connected.
Selecting a transducer
Northstar recommends using an Airmar transducer with the Northstars 490 echo sounder.
Table 1: Northstar-recommended transducers
B250 (P/N 41-088-1-01) B744V/B44V (with 3-wire speed)
1 kW 600 W
50/200 kHz 50/200 kHz
To purchase a single transducer, contact GEM Electronics at: GEM Electronics Company 110 South Acline Avenue Lake City, South Carolina 29560 Phone 843/394-3565 Fax 843/394-3736 If you are a dealer and want to purchase multiple transducers, you can reach Airmar Technology Corporation at: Airmar Technology Corporation (www.airmar.com) 35 Meadowbrook Drive Milford, New Hampshire 03055-4613 Phone 603/673-9570 Fax 603/673-4624 For a list of transducers that are compatible with the Northstar 490, visit Northstars website at: www.NorthstarNav.com
The following basic setup information isnt a substitute for the installation instructions provided by the transducers manufacturer. To ensure that you meet all critical installation parameters, be sure to read and follow all of the requirements in their instructions. Northstar assumes no responsibility for improper installation.
Choosing a mounting location
Do not mount the transducer: behind strakes, fittings, or hull irregularities (mounting in those locations may increase turbulence, aeration, and cavitation) or near the keel near openings for water intake or discharge where it might be loosened by the vessels vibration less than four feet away from the Northstar 961/ 962 processor to minimize interference
The two most common problems with echo sounder installations stem from noise and cavitation. Either of these situations can produce poor performance. Noise occurs when the transducer cable is routed too closely to noise-producing electronics, such as alternators, AC generators, radars, etc. To avoid problems with noise, route the transducer cable by itself (not in a bundle) and away from other wires or cables and the engine. Cavitation is similar to hydroplaning. In some cases, air bubbles will come between the transducer and the water. When this happens, the transducer cant get its energy into the water properly, and wont be able to detect any echoes. To avoid cavitation, choose a mounting location with good water flow all around it at all speeds. Choose the mounting location to obtain the best possible performance from the transducer and the 490. Take into account the vessels maximum speed when selecting a mounting location, as turbulence can affect echo sounding capabilities. Before any drilling or cutting takes place, carefully choose a mounting location for the transducer that meets the following criteria (also see Figure 1 on page 9), depending on the type of vessel:
the transducer and its cable are as far as possible from other electrical cables leaves room above the transducer for the transducers stem, housing, and cable the path for running the transducers cable is reasonably directkeep in mind that the transducer cable is 33 feet long (10 meters). To prevent damage, coil any excess cable and secure it water turbulence and noise are minimal, decreasing the amount of bubbles passing over the transducer face the transducer isnt behind hull irregularities or near eroding paint; both indicate areas subject to turbulence the transducer is as far as possible from the engine or propellers, and inboard of the lifting strakes the transducer always remains submerged and perpendicular to the waterline the transducer is easily accessible from inside the vessel for adjustments and maintenance the transducers ultrasonic beams arent obstructed by the keel, propeller shafts, or any other part of the vessel the transducer is parallel with the water surface the hull thickness falls within the limits in Table 2 below (all dimensions are perpendicular to the waterline):
Table 2: Hull thickness limits
AirMar B44V/B744V with fairing AirMar B44V/B744V without fairing AirMar B250 with fairing AirMar B250 without fairing
6 mm (1/4 inch) 6 mm (1/4 inch) 19 mm (3/4 inch)
19 mm (3/4 inch) 65 mm (2 1/2 inches) 45 mm (1 3/4 inches) 114 mm (4 1/2 inches)
1/3 aft LWL (Load Waterline Length) displacement hull 150-300mm (6-12")
outboard and I/O planning hulls inboard
fin keel sailboat
full keel sailboat
Best location for the transducer
Figure 1: Recommended installation locations for a transducer
Installing a transducer
A flat-bottom hull provides the best environment for mounting the transducer: It provides a horizontal surface and a constant water flow over the transducer, with little turbulence (see Figure 2 for the recommended transducer incline angle). If the vessel has a deadrise angle greater than 5 degrees, mount the transducer on a fairing block to create a horizontal surface and keep the transducer perpendicular to the waterline (see Figure 3). You must order the fairing block, if needed, from the transducers manufacturer.
3 incline angle
1/3 aft LWL (Load Waterline Length)
Figure 2: Recommended transducer incline angle
slope of hull deadrise angle parallel to waterline fairing
fairing thickness at narrowest point 612mm (1/41/2")
Deadrise angle and fairing thickness (B44V shown)
Figure 3: Typical finished thru-hull installation with a fairing block (Airmar B44V)
Maintaining a transducer
Using anti-fouling paint
Do not expose the transducers face or plastic housing to gasoline or strong solvents, such as acetone. These solvents can penetrate and degrade many plastics and reduce their strength. The transducer should be coated with water-based anti-fouling paint to prevent aquatic growth.
paddle wheel insert
Paint exposed housing and bore up 30mm (1-1/4")
Paint outside wall below the lower O-ring including exposed end, paddle wheel cavity and paddle wheel
Anti-fouling paint (B44V shown)
Figure 4: Anti-fouling paint areas (for Airmar B44V)
Use special transducer paint. Other paints may contain copper, which is conductive and can burn out the transducer within minutes!
Cleaning a transducer
To clean the transducer of heavy debris or foul sea growth, use a stiff brush or putty knife, but dont scratch the surfaces. Check the transducer every few weeks, maximum. Use sanding sparingly, as repeated sanding may affect the transducers performance at high speeds. For lighter cleaning, the surface may be wet-sanded with #220 or finer wet/dry sandpaper.
SECTION THREE Installing the 490
Be sure to turn the power off before starting the installation. Further, it is highly recommended that you keep the power off while youre performing the installation. If power is left on or turned on during the installation, then fire, electrical shock, or other serious injury may occur. Be sure to ground the equipment to prevent electrical shock and mutual interference. Be sure that the voltage of the power supply is between 10 and 30 volts DC. Connecting to the wrong power supply can result in fire or damage to equipment. Be sure to use a 3-amp fuse. Using the incorrect fuse can result in fire or damage to the 490.
Keep the following safe compass distances from the 490: 1.0 m standard, 0.8 m steering.
Be sure that the 490 doesnt interfere with any of the on-board systems. Check all other systems to ensure that their performance doesnt degrade when the 490 is turned on. If the vessel is out of the water when the echo sounder is turned on, the transducer may be damaged.
Do not open the 490. There are no serviceable parts inside. Unauthorized tampering with the unit will automatically void the warranty.
Figure 5 on page 14 shows a configured 961/962 echo sounder system, and Figure 6 on page 15 shows a configured 957/958 echo sounder system.
NORTHSTAR 961/962 DISPLAY 10-FOOT CABLE (NORTHSTAR-SUPPLIED) 33-FOOT CABLE (PART OF TRANSDUCER)
NORTHSTAR 961/962 PROCESSOR
NORTHSTAR 490 ECHO SOUNDER
10-FOOT CABLE (NORTHSTAR-SUPPLIED)
RECOMMENDED: AIRMAR B250 1000-W TRANSDUCER FOR THE 490-D AIRMAR B44V/B744V 600-W TRANSDUCER FOR THE 490-S
Figure 5: 961/962 echo sounder system components
NORTHSTAR 2201 GPS
33-FOOT CABLE (PART OF TRANSDUCER)
Connecting the 490 to ships power
Red Positive (+) (fused lead) Black Negative () Green Ground (earth)
The 490 should be grounded to the vessel to eliminate interference. Secure either the green wire or a ground wire from the 490s grounding terminal (on the far right side of the unit) to the vessels nearest grounding point. Without an earth grounding, performance may be degraded.
Connecting the 490 to the 961/962
The connection between the 961/962 and the 490 requires the 10-foot (3-meter) data cable supplied by Northstar. The cable connects to the P1 slot on the back of the 961/962. Figure 8 below illustrates the wiring at the 961/962 end of the cable. Table 3 describes the pins functions.
961/962 P1 Connector Plug (Wiring Side View)
Orange White Violet Brown Black Blue Red (not connected) Data Cable
Figure 8: Interface cable connection from 961/962 to 490
Table 3: Cable connection between the 961/962 and 490
961/962 pin number
11 12* 12*
961/962 P1 signal name
Port 3 In (A) Port 3 In (B) Ground Port 3 Out (A) Port 3 Out (A)
Cable wire color
Blue Black Brown Violet White
Table 3: Cable connection between the 961/962 and 490 (cont.)
Port 3 Out (B) Ground Not connected
Orange Green Red
* Connector P1, pin 12 on the 961/962 requires two connections from the cable. **The red wire is not connected on the 961/962 end, and should be insulated and capped.
Connecting the 490 to the 957/958
The connection between the 957/958 and the 490 requires the 10-foot (3-meter) data cable supplied by Northstar. The cable connects to the AUX port on the back of the 957/958. Figure 9 below illustrates the wiring for the 957/958 end of the cable. Table 4 describes the pins functions.
Brown (1) Green (1) White (2) Blue (6)
Orange (5) Violet (4) Black (3)
Figure 9: Interface cable connection from 957/958 to 490
Table 4: Cable connection between the 957/958 and 490
957/958 pin number
1* 1* 2 3
AUX port signal name
Shield/Gnd Remote On Gnd Remote On input NMEA AUX In (B)
Brown Green White Black
Table 4: Cable connection between the 957/958 and 490 (cont.)
NMEA AUX Out (A) NMEA AUX Out (B) NMEA AUX In (A)
Violet Orange Blue
* Pin 1 on the 957/958 AUX port requires two connections from the cable. The red wire is not connected on the 957/958 end, and should be insulated and capped.
Connecting the 490 to a transducer
Figure 10 below shows how to terminate the transducer cable for connection to the 490. Pay close attention to whether youre wiring a 490-S or a 490-D. See also the Transducer Connector Instructions (GM492).
Table 5: 490-to-transducer connector pin wiring
Speed signal Speed +V Speed ground Thermistor (temperature) Depth low+ (unused on 490-S) Depth low- (unused on 490-S) Thermistor (temperature) Depth high+ Depth shields Depth high-
Figure 10: Wiring of transducer cable (solder-cup side of connector shown)
Powering up, setting up, and powering down the 490
Turning the 490 on For the 961/962
This section assumes that the 490, Northstar 961/962, and transducer are now all properly connected. To use the 490 echo sounder, the 961/962 must be running software version 3.0 or higher. If not, contact Northstar to obtain the upgrade CD. To install the upgrade, follow the steps on the back of the jewel box. Turning on the 961/962 processor automatically turns on the 490 (be sure your vessel is in the water). To turn the 961/962 on, briefly press its PWR key. You must set the 961/962s Port 3 to 490: 1. 2. 3. 4. Press STAR to display the SERVICE MENU screen. Press PORT SETUP. Press PORT 3. Set the FORMAT option to 490.
The STAT (status) indicator light on the 490 glows steady green when the 490s power is on.
For the 957/958
This section assumes that the 490, Northstar 957/958, and transducer are now all properly connected. Turning on the 957/ 958 automatically turns on the 490 (be sure your vessel is in the water). To turn the 957/958 on, briefly press its PWR key. You must set the 957/958s AUX port to 490: 1. 2. Press the STAR key to display the OPTIONS/SERVICE INFO screen, then press the PORT SETUP OPTIONS key. Set the AUX PORT option to 490, then press the ENTER key.
Setting up the echo sounder
Youll need to set the echo sounder display options on the 961/ 962 or 957/958s ECHO SOUNDER SETUP screen. Press the STAR key to display this screen and set these options. For details, see the Northstar 490 Echo Sounder Operations Manual (GM490). To turn off the 490, turn off the 961/962 or 957/958 by pressing and holding PWR until the screen goes dark. The 490 will turn off automatically.
Turning the 490 off
If the vessel is out of the water when the echo sounder is turned on, the transducer may be damaged. Perform all tests on the with the vessel in the water.
Make sure the vessel is in the water. To test the system after installation, turn on the 961, 962, or 957/958 and confirm that power is on with no errors. If echo sounder data isnt moving across the ECHO screen from right to left, see Troubleshooting common 490 installation problems on page 23.
SECTION FOUR Troubleshooting and servicing the 490
Troubleshooting common 490 installation problems
Typical problems you may encounter either during or after the 490 installation process are outlined in Figure 11 on page 24 and Figure 12 on page 25. In the 961/962, the diagnostics screen may also help pinpoint the problem.
No echoes displayed when STAR key is pressed.
Is the Advance Speed set to zero?
Change the Advance Speed setting.
Contact Northstar Service to upgrade to the latest version of 961/962 software.
Is the 961/962 software Version 3.0 or greater?
Configure NMEA Port 3 for the 490. See the 490 Operations Manual (GM490) for instructions.
Has NMEA Port 3 been configured for the 490?
1. Check fuses and circuit breakers 2. Check power to 490 with a voltmeter. 3. Verify that the data cable between the 961/962 and the 490 is properly wired and connected.
Check the 490's STAT indicator
1. Check transducer connector for the proper wiring. 2. If wiring is correct,check transducer impedance with an ohmmeter. 3. If the transducer is open or shorted, replace it
FLASHING FOUR TIMES PER SECOND
ONCE PER The 490 and the 961/962 aren't communicating properly. SECOND Check the wiring of the data cable between the 961/962 and the 490.
What is the flash rate of the STAT indicator?
There's a hardware problem with the 490.
Figure 11: 961/962 echo sounder system troubleshooting
Configure 957 Aux Port for the 490. See the 490 Operations Manual (GM490) for instructions.
Has 957 Aux Port been configured for the 490?
1. Check fuses and circuit breakers. 2. Check power to 490 with a voltmeter. 3. Verify that the data cable between the 957 and the 490 is properly wired and connected.
The 490 and the 957 aren't communicating properly. Check the wiring of the data cable between the 957 and the 490.
Once per Second
What Four Times is the flash per Second rate of the STAT indicator?
Figure 12: 957/958 echo sounder system troubleshooting
Getting technical support
You can email the Northstar Service Department directly from Northstars website (www.NorthstarNav.com). Here, you also can access additional technical information under either the Manuals link (you can download manuals in PDF form) or Support link.
After youve followed the instructions in this manual, if you need additional technical or operations support for the 490, or if you have any other service-related questions, you can contact either your dealer or the Northstar Service Department. You can reach Northstars Service Department by email, fax, U.S. mail, or phone as described in Table 6 below.
Please have the following items available when you contact Northstars Service Department: the 490s serial number, located on the top of the unit the transducer manufacturers name and the transducers model and part number
Please be as complete and accurate as possible when describing the problem so that a service technician can research the problem and provide the quickest response. Northstars Service Department is available between 9:00 AM and 5:00 PM Eastern Time, Monday through Friday, excluding major holidays. If you have questions about purchasing parts or finding an authorized Northstar dealer, or if you want basic product information and brochures, contact the Northstar Sales Department as described in the table below.
Table 6: Contacting Northstar
Email: Service: service@NorthstarNav.com Sales: sales@NorthstarNav.com
Fax: Service: 978/897-1595 Sales: 978/897-7241
Telephone: Main number: 978/897-6600 or 800/628-4487 Sales: 978/897-0770 Service: 978/897-6600
U.S. mail: 30 Sudbury Road Acton, MA 01720
Table 6: Contacting Northstar (cont.)
Website: www.NorthstarNav.com (you can send email to Northstar directly from this site)
Hearing from you
Your feedback is important and helps Northstar ensure that this manual is a valuable resource for all marine technicians. Send your questions, comments, or suggestions about this manual to: docs@NorthstarNav.com
Ordering replacement parts
To order spare parts or replacement/missing parts, call the Northstar Sales Department at 978/897-0770.
Servicing the 490
Repair of the 490 is performed only at the Northstar factory. Service includes a complete hardware and software check-out.
Field repairs are not authorized and will void the warranty! For transducer service, including parts and repairs, please contact the transducer manufacturer.
For a system under warranty, shipping charges to the factory are the only cost for factory repair. The repaired 490 will be returned via prepaid economy ground freight (units returned overseas are chargeable). The 490 and any accessories returned for warranty repair that are determined to be without fault are subject to a handling charge.
Returning a 490 for service
Before returning the 490 to the Northstar factory, to prevent delays it is critical that you first obtain a Return Materials Authorization (RMA) number from the Northstar Service Department. If the 490 was purchased through a dealer, call the dealer with the 490 serial number so they can help you get an RMA number. The 490s serial number can be found on the label at the top of the 490. Shipments without a proper RMA number will not be accepted!
The 490 is covered by a two-year hardware-only warranty, which, in summary, states that if the 490 is returned to the Northstar factory by the owner or dealer during the warranty period, Northstar will repair or replace, free of charge, any part found to be defective due to faulty materials or workmanship if the system has been properly installed and hasnt been abused. See the Limited Warranty Policy at the front of this manual for further details. The only cost to the owner will be the one-way shipping charges and any associated charges that may be imposed by the dealer. If you have overnight or second-day shipping requirements, before shipping the 490, please call Northstar for turnaround time, freight charges, and payment arrangements. The 490 should be shipped only in a properly designed carton with packing material. Shipments to the Northstar factory should be made to the following address: Northstar Technologies Service Department 30 Sudbury Road Acton, MA 01720 USA
Return the transducer to its manufacturer, not to Northstar.
APPENDIX A Technical specifications
Table 7: 490 technical specifications
Frequencies Output power Pulse lengths Pulse repetition rate Alarms Update rate Zoom modes Auto modes Navigation data Display modes 50 and 200 kHz 1000 watts (490-D); 600 watts (490-S) 0.1 to 2 ms 30 to 600 pulses/min Fish, bottom, and temperature 10 Hz maximum (depends on water depth) Marker, bottom lock, bottom lock/center, bottom Fishing or cruising Shown on bottom of screen Single/dual frequency, split-screen, four zoom modes, A-Scope
Dimensions Weight 10 x 6.25 x 2.5 inches (including backplate) 2 pounds
Table 7: 490 technical specifications (cont.)
Temperature Standards -25C to +60C operating temperature -55C to +90C storage temperature Waterproof, sealed design meets the following: EN60529 IP65; EN60945 emissions; CE
10 to 30 VDC, 8 Watts, reverse polarity and overvoltage protection Transducer outputs protected against open circuit/ short circuit
Gain Clutter Signal level Noise limiter White level Range Advance speed Depth units Installation calibrations 0 to 75 db 0 to to 5 ON/OFF Background color up to 2400 feet (800 meters) 1/8 to 2/1 Feet, meters, fathoms Speed, temperature, gain, transducer depth/offset
The formation of bubbles, which may negatively impact a transducers readings by reducing its ability to put energy into the water. The rise of the bottom of a vessel above a horizontal line at the center of the vessel; that is, the slope of the hull away from the horizontal. An instrument that uses sound waves to measure the depth of a body of water or an object (such as a school of fish) below the waters surface. A block used to create a horizontal surface for mounting a thru-hull transducer when the vessels deadrise is more than 5 degrees. The device mounted through the hull to send and receive ultrasonic beams that determine seabed conditions and locate fish. Essentially, a transducer is an energy converter, which changes electricity to sound (send) and sound to electricity (receive).
An imaginary column through the water created by the path of a single transducer ping and its echoes.
Airmar Technology Corporation
Cable 490 and 490 and 961/490 and ships power 17 Cautions installation 2, 5, 6, 13 interference with tampering with the transducer 5, 7, 22 troubleshooting the wiring the 490 17
Echo sounder components of system 1, 14 definition of 31 installation. See Installation, 490 serial number 28 setup options 22 specifications 29 STAT indicator light 16, 21 turning off 22 turning on 21 wiring 17 Electrical power, requirements 17
Fairing block, definition of
GEM Electronics Company
Installation 490 cautions 2, 13, 14, 17, 22 connecting to connecting to 961/connecting to ships power 17 electrical power requirements 17 general considerations 2 mounting dimensions 16 mounting location 15 overview 13 safety considerations 13 troubleshooting 23 wiring 17 transducer cautions 5, 7, 22 cavitation 8 hull thickness limits 8 noise problems 8
preferred mounting location 8 recommended incline angle 10 thru-hull installation with a fairing block
Northstar 490 Echo Sounder. See Echo sounder Northstar 957 GPS/WAAS Chart Navigator 1, 3, 15, 21 Northstar 961/962 GPS Chart Navigator 1, 3, 15, 21 Northstar Technologies feedback on manuals 27 sales department 26 service department 26 website. See Website addresses
Parts, ordering. See Technical support
Safety considerations transducer 5 Service. See Technical support Software upgrades, obtaining 21 Specifications 29 STAT (status) indicator light 16, 21
Technical support contacting Northstar 26 ordering parts 27 repairing the repairing the transducer 27 returning the Transducer definition of 31 installation. See Installation, transducer maintenance. See Maintenance, transducer mounting. See Installation, transducer purchasing 7 recommended 6 service, parts and repair 27 Troubleshooting diagnostics screen 23 flow chart 25 installation checklist 22 installation problems 23
Upgrades, obtaining software 21
Warranty for the 490 3, 28 Water column, definition of 32 Website addresses Airmar Technology Corporation 7 Northstar Technologies 7, 26, 27
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