Overview How the NS25 Works Congratulations on your purchase of the Hummingbird NS25. The NS25 uses GPS and sonar capability to determine your position, display it on a map, and provide detailed underwater information. The NS25 consists of four primary components; the control head, GPS receiver (SAT MAX), card reader and transducer. The control head contains the user controls and display. The GPS receiver receives signals transmitted by the constellation of GPS satellites orbiting the earth. It selects four or more satellites whose position and signal strength provide the most accurate position. From these four satellites, the GPS receiver calculates time, boat position (latitude/longitude), boat speed and direction of travel. The card reader displays electronic map information from the cartridges installed. The transducer is mounted beneath the water surface and converts electrical energy from the transmitter into mechanical pulses or sound waves. The transducer also receives the reflected sound waves and converts them back into digital signals for display on the sonar unit.
GPS The Global Positioning System (GPS) is a satellite navigation system designed and maintained by the U.S. Department of Defense. GPS was originally intended for military use, however, civilians may also take advantage of its highly accurate position capabilities, typically within +/100 meters. This means that 95% of the time you will be within 300 feet of your actual position. Further capabilities are possible with the Differential Global Positioning Systems (DGPS), which operate to refine satellite signal to the most accurate position possible GPS uses a constellation of 24 satellites that continually sends radio signals to the earth. Your position is determined by receiving signals from four or more satellites and measuring the distance from the satellites to determine your present position.
SONAR Sonar uses sound waves to determine the presence and location of underwater objects. The time measured between the transmission of the sound wave and the reception of any reflection is used to determine distance. The transmit and receive cycle is very fast. A sound wave can travel from the surface to a depth of 240 feet and back again in less than of a second, so it is unlikely that your boat can outrun this sonar signal. Analysis of the reflected signal can also be used to determine location, size, composition, etc. NOTE: Actual depth capability depends on such factors as bottom hardness, water conditions, and transducer installation. Units will typically read deeper in fresh water than in salt water. After spending a few minutes with your NS25 on the water, you will see the units ability to accurately portray the underwater terrain, suspended targets, GPS position, and your position on a map. Your NS25 comes with everything necessary for installation and operation on most boats. The transducer included, XT-6-20, is designed for mounting on the transom of the boat (directly exposed to the water). On fiberglass hull boats , this same transducer can be bonded to the inside of the hull. When mounted inside the hull, the sonar signal actually passes through the hll of the boat. Both mounting techniques produce acceptable results on most boats.
Installation Parts Supplied Before installing your NS25, please ensure that the following parts are included in the box: Control Head GPS Receiver Transducer with 20 foot cable Quick-Disconnect mounting hardware kit Control head mounting hardware kit GPS receiver mounting hardware kit Card reader mounting kit Transducer mounting hardware kit 6 foot power cable 20 foot GPS receiver extension cable GPS Y cable for NMEA output and GPS receiver input Publication kit In-dash mounting kit
It is recommended that you install the NS25 components in the following order; 1) GPS receiver, 2) transducer, 3) card reader, then 4) control head.
GPS Receiver Installation To optimize performance of the GPS receiver, mount it in an area that has full exposure to the sky. The effective area of reception is 10 degrees above the horizon. Different circumstances determine the mounting method appropriate for your GPS receiver. If you have An existing antenna stem with Standard thread Under location access with Deck less than 3/8 Under location access with Deck greater than 3/8 No access under mounting Then install: Stem Mount (Existing Stem Fig. A) Deck Mount (Thin Deck- Fig. B) Deck Mount (Thick Deck Fig C) Deck Mount

7. 8. 9.

INSTALLATION PREPARATION
PARTS SUPPLIED PARTS SUPPLIED Before installing your new Humminbird fishfinder, please ensure the following parts are included in the box: Fishfinder Transducer with 20 (6m) of cable and mounting hardware kit Mounting system and mounting hardware kit 6 (2m) power cable Publications kit
It any of these items is missing, call our Customer Support Hotline. ACCESSORIES Humminbird offers a wide assortment of accessories that complement and expand the capability of your new fishfinder. These accessories are designed with the same high standards and are backed by the same one-year warranty. The Humminbird Accessory catalog included with your unit contains descriptions of the many accessories available and ordering information. All Humminbird accessories are available through your full-service Humminbird dealer or factory direct through our number listed in the Customer Support section. INSTALLATION OVERVIEW Your Humminbird fishfinder consists of two primary components to install: the control head and the transducer. The control head contains the sonar transmit and receive circuitry, as well as the user controls and display. It should be installed in a location that provides access to the controls and visibility while in use. The control head mounts on a quick disconnect mounting system that swivels and tilts providing flexibility for viewing from almost anywhere on the boat. The transducer converts electrical energy from the transmitter into mechanical pulses or sound waves. The transducer also receives the reflected sound waves and converts them back into electrical signals for display on the control head. It should be installed in contact with the surface of the water in an area that has smooth waterflow- usually on the transom of the boat. There are several mounting options for the transducer. Review the following section to determine the method that works for you and your boat.
INSTALLATION OVERVIEW Determining How to Mount the Transducer Your Humminbird fishfinder includes a standard transducer. This transducer can be mounted on the transom of the boat or bonded to the inside of a fiberglass hull boat. The transom installation, which is the most widely used, places the transducer on the outside of the boat hull. This technique produces the least signal loss, and provides a way to adjust the transducer after installation. The mounting hardware included is designed to protect both the boat and the transducer should the boat strike debris in the water or when trailering. As an alternative to transom mounting, it is possible on many fiberglass-hulled boats to glue the transducer on the inside of the boat hull. Since fiberglass has similar sonar characteristics as water, the sonar signal can pass through the boat hull with minimal loss. The hull of the boat must be single layer construction (not double-hulled) Also, any air trapped in the lamination of the fiberglass would prevent the sonar signal from passing through. Inside the hull installations require no holes be drilled into the boat and through experimentation, high-speed operation comparable to transom mounting can be achieved. Two-part slow cure epoxy (not included) is required to glue the transducer in place.

INSTALLATION

TRANSOM INSTALLATION Do not begin this transducer installation until you read the Installation Preparation in the Operation Guide. This chapter contains information critical to the correct installation of your transducer. Due to the wide variety of boat hulls, only general instructions are presented in the installation guide. Each boat hull represents a unique set of requirements that should be evaluated prior to installation. TRANSOM INSTALLATION Step One - Determine Where to Mount the Transducer Begin the transducer installation by determining where on the transom to install the transducer. Consider the following to find the best location: It is very important to locate the transducer in an area which is relatively free of turbulent water, As a boat moves through the water, turbulence is generated by the weight of the boat, and the thrust of the propeller(s). This turbulent water is normally confined to areas immediately aft of ribs, strakes or rows of rivets on the bottom of the boat, and in the immediate area of the propeller(s) (Figure 1). On outboard or inboard/outboard boats it is best to stay at least 15 (40cm) to the side of the propeller(s). If possible, viewing the transom of the boat while the boat is moving will provide the best means of locating turbulence free water. If maximum high-speed operation is a high priority, this is the recommended method. If this is not possible, select a location on the transom where the hull forward of this location is smooth, flat, and free of protrusions or ribs. The transducer when mounted should point straight down. The design of the transducer will accommodate a wide range of deadrises and remain ported straight down (Figure 2). On boats with stepped hulls, it may be possible to mount the transducer on the step. Never mount the transducer on the transom behind a step, as this area of the transom will not be in contact with the water at high speed (Figure 3).
TRANSOM INSTALLATION If the propeller(s) is (are) forward of the transom, it may be impossible to find an area clear from turbulence, and a different mounting technique or transducer type should be considered.

Step Two - Drill the Mounting Holes 1. Remove the mounting template from the front of the Operations Manual. 2. Hold the template on the transom of the boat in the location where the transducer will be installed (Figure 4). Align the template vertically, ensuring the lower edge of the transom meets with the bottom corner of the template. 3. Using a pencil or punch, mark the two mounting holes shown on the template onto the transom. Do not mark or drill any other holes at this time. 4. Using a 5/32 (4mm) bit drill the two holes to a depth of approximately 1" (3cm). On fiberglass hulls, it is best to start with a smaller bit and use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating. Step Three - Assemble the Transducer 1. Attach the Pivot to the transducer body as shown in Figure 5, using the #8 3/8 (9mm) long allen headed pivot screw, the headed pin, the two flat washers, and the two toothed lock washers. Note: The toothed lock washers must be positioned between the transducer and the pivot ears. The flat washers must be positioned to the outside at the pivot ears. 2. Using the AIlen wrenches provided, loosely tighten the pivot screw (Figure 6). Do not completely tighten the assembly at this time, so the pivot angle can be adjusted later. 3. Insert the pivot/transducer assembly into the mounting bracket as shown in Figure 7. Do not snap the assembly closed.
TRANSOM INSTALLATION Step Four - Mount the Transducer to the Transom 1. Apply silicone sealant to the mounting holes drilled into the transom. 2. Align the transducer assembly with the drilled holes in the transom (Figure 8). 3. Use either a flat head screwdriver, a 5/16" (8mm) hex driver, or a 5/16" (8mm) socket to mount the assembly. Using the two #(25mm) long slotted hex head screws, mount the transducer assembly to the transom as shown. Do not fully tighten the mounting screws in order to vertically adjust the transducer. Snap the pivot down into place. Step Five - Adjust the Running Position of the Transducer The bracket allows height and tilt adjustment, the pivot screws allow angular adjustment. Initially, adjust the transducer as described in the following paragraphs. Further adjustment may be necessary to refine the instillation after high speed testing. 1. First adjust the pivot angle of the transducer body so its length is parallel with the length of hull of the boat. Then pivot the transducer down so the rear is about 1/4 inch (6mm) lower than the front (Figure 9). 2. Fully tighten the two pivot screws using the Allen wrenches. It may be necessary to retighten the pivot screws after the initial use as the plastics may still be seating to the lock washers. 3. Adjust the height of the assembly so the face of the transducer is 3/16" (4.5mm) beneath the lower edge of the transom (Figure 10). Mark the position of the mounting bracket on the transom with a pencil. 4. Force the pivot to the up position to gain access to the mounting screws. Assure the transducer location has not changed, then fully tighten the two mounting screws (Figure 11). Snap the pivot back down. Confirm the pivot angle has not changed. Note: A third screw location is provided for the

NOTE: If the cables must pass through the mounting surface at a different location, drill the 1 hole at that location and pass the cables through from underneath. Also, you must break out the wire slots on the rear of the mounting base using needle-nosed pliers.
Insert all cables through the 1 hold and grommet from beneath the mounting surface. Pass cables first through the grommet (if the cables hold is underneath the mounting bracket), then through the mounting base and top of mounting bracket. Press the grommet in place around the cables and into the 1 hole. Place the mounting bracket on the mounting surface aligned with the drilled holes. Insert the four flat-head wood screws into the mounting holes and tighten fully.
Optional: If the cables pass outside the mounting bracket, install the hold cover (supplied) over the hold and fasten in place using the two #8 x 7/8 wood screws provided.
Assembling the Connector Holder Follow these steps to assemble the connector holder. 1. Insert the cable connectors into the connector holder. The slots for the connectors are keyed to prevent reverse installation, so be careful not to force the connector into the holder.
Carefully pull the excess cable from beneath the mounting surface so the connector holder aligns with the mounting holes on the front of the mounting bracket. Snap the support plate to the rear of the connector holder as shown.
Insert the connector holder into place and use the two #6-32 x3/4 screws to fasten it to the mounting bracket.
Install the control head by sliding it onto the mounting bracket until it is fully seated. Then unit should snap into place. (To remove the unit, simply depress the latch on the ear of the unit and lift.)
Your NS25 unit is now ready for operation.
Testing The Installation GPS Testing Check System Status screen to confirm the unit is picking up satellite signals (shown in Satellite Status box). Once three satellite icons turn black, and the Receiver Status displays Position Fix, the unit will automatically select the North-Up view to display your location.

Button Functions The NS25 has 10 buttons to control all unit functions. Buttons are used for navigation options and entering data. See the following illustration and descriptive table listing buttons and functionality.
Power/Light: Turns on the unit initially. Pressing and holding the Power button for three seconds turns unit off. Pressing it briefly while the unit is operating displays the Adjust Backlight menu. View: Selects the six different views: North-Up, Course-Up, Combo, Sonar, Numeric, and System Status. Cursor: Used to move the cursor (cross-hair line visible in graphics area),pan the map, and select waypoints. Used to make selections when menus are displayed. Zoom +/-: Controls the range at which the map is drawn on the screen. The + button increases the map range. The - button decreases the map range. Menu: Displays the Main Menu Bar list and toggles through each of the five menu options. Go To: Initiates navigation to a destination. Info: Displays detailed information for highlighted waypoints. Controls information display settings for graphical and numeric information. P-Star: Instantly stores the location of your present position. If the cursor is on-screen, the cursor position is stored. Clear: Exits any current operation, clears screen of bird-notes, and mutes an active alarm. When no action has been initiated a menu provides options to clear course history, current route, and temporary waypoints.
Views Six views in the NS25 display your position, maps, numeric information boxes, and sonar information. Press the VIEW button to toggle between each of the views in the sequence: North-Up, CourseUp, Combo, Sonar, Numeric, and System Status. This toggle function is a continuous loop, so if you miss a view, keep pressing the VIEW button to return to the view you would like to display.
On views displaying a map, your present position is indicated by a square if you are stationary, or a boat icon if you are moving. The graphic course indicator always shows your course relative to north. A course history trail tracks where you have traveled. A map range indicator displays the current map range selected by the Zoom +/- buttons. NOTE: C-Cards contain different map ranges depending on the card and your area of operation. More detailed map ranges will be available in some areas, and less detail in others. All views can be customized to display more or less detailed numeric and graphic information (see User Customization for detailed information).

North-Up View

Zoom +/- Around Cursor Location for More Map Detail The Zoom +/- feature controls the range viewed on the map around the cursor position. Press Zoom = to reduce the range of the map. Press Zoom to increase the range. When adjusting the Zoom feature, a box displays in the graphics area indicating the size of the new range.
Note: When using C-Cards, the lower zoom levels in the Zoom +/- feature may not display cartography. This depends on the cartridge you are using, and the area of operation.
Using the Cursor to Pan the Map The cursor may also be used to scroll the map on the display screen. When the cursor reaches the border of the viewing area the map begins scrolling. Press CLEAR to return to the view to show your present position.
Using the Cursor to Get More Detailed Information The cursor is used with the INFO button to get detailed information on a waypoint. When the cursor is within rang, the cursor will snap to and highlight the waypoint.
Once the waypoint is highlighted, press INFO to display more detailed waypoint information.
Extremely detailed information is available for objects and areas built into the C-Map cartography. Icons appear on the maps displaying the locations of lights, buoys, and other man made features, as well as natural areas such as tideways, current zones and sea bottom conditions. Moving the cursor to an object on the C-Map, and pressing INFO displays information about that object.

Customizing the Display

The NS25 has customization features for selecting specific information you want to display onscreen, such as place names, depth contours, spot soundings, numeric infoboxes, etc. In any of the views, you may press the INFO button to set the information Priority Level, Customize Numeric Information, and Assign Information Priority Levels. Customization features and their functionality are described below. All vi ews except System Status can be customized.
Adjust Information Priority Level Information Priority Level menu determines objects drawn on-screen such as place names, waypoints, depth contours and infoboxes. Making adjustments can quickly add or eliminate objects on-screen to reduce clutter. Highlighting fewer numbers in the menu displays less information, highlighting more numbers displays more information. Refer to figures 1 & 2 for examples. Information Priority Levels can be completely customized to your preferences via the Assign Information Priority Levels menu. This menu accesses the list of objects to which your personal priorities can be assigned (1 is highest priority, 7 is lowest priority). The information Priority Level menu setting draws the objects on-screen based on these priorities you have set. For example, highlighting the numbers 1, 2, 3, and 4 in the Information Priority Level menu draws objects with a priority of 1, 2, 3, and 4. Highlighting the number 1, only draws objects with a priority of 1.

Arrival Alarm If the Arrival alarm is on, an alarm boundary is drawn around the current destination waypoint. When the Distance To Go (DTG) to the Waypoint is less than the alarm setting, the alarm will sound. The factory setting for the Arrival Alarm is.1nm. This can be adjusted manually (see Using the Menu System Alarms for mire information. Waypoint Sequencing as you move beyond a destination waypoint within the route, the NS25 automatically sequences to the next waypoint providing new navigation information. At times, the NS25 may not be able to determine when to automatically sequence to the next waypoint. When this occurs, a menu displays to permit manual sequencing.
Modifying a Route While Traveling While traveling a route, you can modify it as you go. You may add waypoints to the end or middle, replace the current waypoint, skip waypoints, or redirect the route entirely. To skip a waypoint or series of waypoints, use the cursor to highlight the waypoint within the route that you want to go to, then press GOTO. A men appears to confirm. Select Yes to skip to the new waypoint. The track line redraws your route with updated information. To make other modifications, use the cursor to highlight a waypoint you wish to change, then press GOTO. A menu displays the options for the highlighted waypoint.
Note: If you have not identified a destination, pressing GOTO gives you options to Enter Numeric Coordinates, Use the Cursor, Select a Waypoint from the Waypoint List, or go to the Last P-Stor Position. After selecting the waypoint, the GO TO options to modify route menu displays for chanding the route.
Choose the option from the menu which changes the route as you need. Refer to the figures below for exact examples of how the route is modified for each selection.
Ending a Route A birdnote displays to alert you once you have reached the last waypoint in the route. To end a route, press CLEAR once the final waypoint has been reached. Select YES from the Clear Route menu to end the current route.
Using the Menu System The NS25 displays five menu options on the Main Menu Bar: Waypoints, Routes, Sonar, Alarms, and Set-Up. These options allow you to customize navigation and sonar settings. Press the MENU button to display the Main Menu Bar, once the Main Menu Bar is on-screen, the Menu button is used to toggle between the five Main Menu Bar options. Each selection made on the Main Menu Bar displays a list of menus.

Note: Using the Clear or Menu key to exit at this point will save waypoint information. 4. The Enter Name menu displays. Scroll through letter fields to name the waypoint (name is limited to 16 characters), then select OK when finished. The Select Symbol menu displays. Scroll through symbol fields to make a selection, then select OK when finished. Select None if you do not wish to assign a symbol. The Save Waypoint menu displays. Select Yes to save to permanent waypoint list. Select No to cancel and enter information again.
Note: The NS25 will assign a system number to a new waypoint. This number is not always in the sequence in which it was created.
To change an existing waypoint: 1. Highlight Change, then select Yes to display the Change waypoints screen. Scroll through waypoint list to highlight a waypoint. Select Change to initiate procedure.
Note: If the selected waypoint is a temporary waypoint, it becomes a permanent waypoint when selecting Change. 2. The Change Latitude menu displays. Scroll through digits to make changes, if needed. Select OK when finished.
The Change Longitude menu displays. Scroll through digits to make changes, if needed. Select OK when finished. The Change Name menu displays. Scroll through letters to make changes, if needed. Select OK when finished. The Change Symbol menu displays. Scroll through symbols to make changes, if needed. Select OK when finished. The Save Changes menu displays. Select No to discard changes, select Yes to save changes.
To delete waypoints: 1. 2. Highlight Delete, then select Yes to display the Delete Waypoints screen. Scroll through waypoint list to highlight a waypoint, then select Delete to mark for deletion.
Note: A waypoint marked for deletion is noted by an X next to the waypoint symbol in the list. Waypoints are deleted from memory when you exit this screen.

Routes

Routes link a series of waypoints together to create a path that can be saved and used later. They are comprised of 2 to 50 waypoints and can be traveled in whole or in part, in either direction. There are two types of routes: temporary (up to 10 can be created using the GOTO key), and permanent (up to 20 can be created in the Route menu). You may select SHOW in some menus to display the selected route in a map view.

The Adjust Off Course menu displays. Scroll to a setting from.01NM to 1NM.
Note: the alarm setting is saved immediately.
To set Arrival Alarm 1. 2. 3. 4. Highlight Arrival Alarm Select ON to activate the alarm. The factory setting is.1NM. Select Adjust to change the numeric alarm setting. The Adjust Arrival Alarm menu displays. Scroll to a setting from.01 to 1NM.
To set Drift Alarm: 1. 2. 3. 4. Highlight Drift Alarm Select ON to activate the alarm. The factory setting is.1NM. Select Adjust to change the numeric alarm setting. The Adjust Drift Alarm menu displays. Scroll to a setting from.01NM to 1NM.
To set Depth Alarm: 1. 2. 3. 4. Highlight Depth Alarm. Select On to activate the alarm. The factory setting is 15 ft. Select Adjust to change the alarm setting. The Adjust Depth Alarm menu displays. Scroll to a setting from 2 to 99 feet.
To set Fish Alarm: 1. 2. 3. Highlight Fish Alarm. Select On to activate the alarm. The factory setting is set to alarm on all fish symbols. Select Adjust to change the alarm setting.
The Adjust Fish Alarm menu displays. Highlight the fish symbol to sound the alarm.
Set-Up The NS25 allows you to customize many features to work best for a particular use. The unit remembers these settings after power is disconnected. Listed below are descriptions and steps for Set-Up options.
Contrast Contrast adjusts the lightness and darkness of the screen to accommodate for outdoor lighting conditions.
To set Display Contrast 1. 2. Highlight Display Contrast Elect desired setting from 5 to +5. The factory setting is zero.
Units-Speed Units Speed sets the units of measure your speed displays in, i. e., mph, or kts (knots).
To set Units Speed: 1. 2. Highlight Units-Speed Select mph or kts. The factory setting is kts.
Units-Distance Units Distance sets the units of measure your distance displays, i.e., statute mile (sm) or nautical miles (nm).
To set Units-Distance 1. 2. Highlight Units-Distance. Select sm/ft or nm/ft. The factory setting is nm/ft.
Time determines the format in which the current time will display, i.e., UTC or Local.

To set Time: 1. 2. Highlight Time. Select UTC, or Local. The factory setting is UTC. If Local is selected, select Set Local to set the clock. To set local time, select am, pm, or 24. Scroll to select appropriate time.
Note: Only hours are adjustable. 5. Select OK to set time.
Coordinate System Coordinate System determines the format in which your position is displayed.
To set Coordinate System: 1. 2. Highlight Coordinate System. Select appropriate coordinate format. The dd.mm.mmm setting is the factory setting. If Loran TDs is selected, then select Set-Up. The Loran Set Up screen displays. Select the appropriate Group Repetition Interval (GRI) for your area of operation. Highlight Secondary 1. Select a secondary station. Highlight Secondary 2. Select a secondary station.

3. 4. 5.

Note: Loran TDs cannot be directly entered when using the waypoint menus. The position entry options will be difficult to Latitude and Longitude when Loran TD is selected.

North Reference

North Reference determines the course and bearing calculations, relative to true magnetic north.
To set North Reference: 1. 2. Highlight North Reference. Select True or Magnetic. The factory setting is True.

Map Datum

Map Datum selects the geodetic datum for drawing the map.
CAUTION: This setting must match the datum used to create the map. Typically, this setting does not need to be adjusted.
To set Map Datum 1. 2. Highlight Map Datum. Select the datum for the map, the factory setting is WGS 84. If Custom is selected, then select Set-Up. The custom Datum Set-Up menu displays. Select the appropriate Ellipsoid, DX, DY, and DZ values.
Note: Make sure your settings for the custom datum match the map source.
Course History Course History sets the time intervals used to plot the course history trail. This is represented by a trail of squares.
To set Course History: 1. Highlight Course History.
Select an interval ranging from 1-15 seconds. The factory setting is 5 seconds.
Note: The larger the interval, the more distance you can cover with the course history trail.
Assign IPLs (information Priority Levels) Assign IPLs sets the priorities for objects drawn on-screen. See Views- Customizing the Display for more information.
To set IPLs: 1. 2. Select Yes to display the Assign Priority Level menu. Scroll through the objects list to select an object, then assign it a priority level 1-7. Continue scroll through the objects list to prioritize objects for display according to your preference.

Land-Water

Land-Water inverts the colors for land and water on screen.

To set Land-Water:

Highlight Land-Water. Select Normal or Inverted to set the shading for features on the map. The factory setting is Normal.

DGPS The NS25 is compatible with DGPS (Differential Global Positioning System), which uses radio tower signals to enhance position accuracy. These signals are available in select areas, check your area of operation for DGPS coverage. DGPS input uses an RS-232 serial connection and accepts data in the RTCM SC-104 data format. It is compatible with Communications System International (CSI) model MBX-2 and Magellan model DBR. The red wire is used for signal and the black wire is used for ground. The NS25 should be set at a baud rate of 4800 or 9600 (default), whichever is compatible with your Differential Beacon Receiver. This setting is made in the Set-Up menu (see Using the Menu Set-Up for more information). If connected, check DGPS field in the System Status view to confirm unit is receiving correction signal. If NONE displays in the field (indicating that it is not receiving), try toggling between both baud rates and check connections. Refer to your DGPS manual for further instructions.
Maintenance and Warranty.
Specifications Sonar Operating Frequency 200 kHz

Power Output

300 Watts (RM) 2400 Watts (Peak to Peak)
Transducer Area of Coverage Depth Capability Cable Length
Single Beam: XT-6-degrees @ -10db 1000 feet 20 feet
Control Head Display Type Display Size Display Matrix Backlight Mounting Construction Dimensions FSTN 4 Level Grayscale 3.40 V x 4.53 H 240 V x 320 H Electroluminescent (EL) Quick Disconnect or In-Dash High Impact Polycarbonate with Silicone Gasket 7.5/8 h x 7 7/8 w x 4 3/8 d
GPS Receiver Channels Antenna Type Cable Length Mounting Socket Construction Dimensions 12 Parallel Passive Patch 20 feet (included) Standard Marine Thread High Impact Polycarbonate with Silicone Gasket 3 1/8 h x 3 3/8 w x 4 1/16 d
C-card Reader Map Format Cards Accepted Cable Length C-Map NT feet
Communication NMEA V2.0 Output Only Sentences Supported: APB, BWR DGPS Input: RS-232, RTCM SC104 Data format. 4800/9600 Baud (Magellan DBR, CSI MBX-2)
Memory Waypoints Routes Course History 250 Permanent, 50 Temporary 20 Permanent, 10 temporary 1000 Points
Power Voltage Input In-Line Fuse Power Consumption VDC 1. 5-Amp Slow-Blow 4. 5 watts @ 13 VDC (Backlight Off) 7 watts @ 13 VDC (Backlight On)

Glossary

CLEAR Deletes temporary waypoints, course history, and routes, Also turns off activated alarms. COURSE Actual direction of travel measured in degrees from North.
CURSOR Cross-hair line in map views used to interact with on-screen information.
COURSE HISTORY A course history line is shown in the graphics area, attached to the present indicator. This shows the history for your course, or where you have been. It shows the history for your course, or where you have been. It is helpful in visualizing the progress, or retracting your course to return to the starting point.

POWER Press POWER once to turn on the NS25. To turn it off, hold down the key for three seconds, until the audible chirp is heard. This will prevent accidentally turning the unit off during normal operation.
P-STOR Stores your preset position as a temporary waypoint, or stores the position of the cursor when it is in use.
ROUTE A series of waypoints stored for navigating to a specific location.
TDs Time differentials from Loran stations.
UTM Selects position readout in Universal Transverse Mercator, the coordinate system used by some maps (such as USGS topographic maps).
WAYPOINT A point of interest stored and included in routes.
XTE Cross Track Error. The XTE is the distance between your position and the desired route.