531442-1_A_141c_Eng.qxd

11/15/2005

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141c Operations Manual

531442-1_A

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Thank You!

Thank you for choosing Humminbird, America's #1 name in fishfinders. Humminbird has built its reputation by designing and manufacturing top-quality, thoroughly reliable marine equipment. Your Humminbird is designed for trouble-free use in even the harshest marine environment. In the unlikely event that your Humminbird does require repairs, we offer an exclusive Service Policy - free of charge during the first year after purchase, and available at a reasonable rate after the one-year period. For complete details, see the separate warranty card included with your unit. We encourage you to read this operations manual carefully in order to get full benefit from all the features and applications of your Humminbird product. Contact our Customer Resource Center at either 1-800-633-1468 or visit our website at www.humminbird.com.

Table of Contents

How Sonar Works Whats On the Display Views 5

Single Beam Sonar. 2

Sonar View. 6 Understanding Sonar History. 7 Real Time Sonar (RTS) Window. 7 Bottom Presentation. 8 Sonar Zoom View. 10 Big Digits View. 11 Circular Flasher View. 11
WARNING! This device should not be used as a navigational aid to prevent collision, grounding, boat damage, or personal injury. When the boat is moving, water depth may change too quickly to allow time for you to react. Always operate the boat at very slow speeds if you suspect shallow water or submerged objects. WARNING! Disassembly and repair of this electronic unit should only be performed by authorized service personnel. Any modification of the serial number or attempt to repair the original equipment or accessories by unauthorized individuals will void the warranty. Handling and/or opening this unit may result in exposure to lead, in the form of solder. WARNING! This product contains lead, a chemical known to the state of California to cause cancer, birth defects and other reproductive harm.

Key Functions

POWER/LIGHT Key. 12 VIEW Key. 12 MENU Key. 13 4-WAY Cursor Control Key. 13 EXIT Key. 14
Powering Up the Unit The Menu System Start-Up Options Menu
Normal Operation. 17 Simulator. 18 System Status. 19
Humminbird, SmartCast, Selective Fish ID+TM, WhiteLine,, RTS, X-PressTM Menu, Fish ID+TM, Structure ID, TrueArchTM, UltraBlackTM, Angler Profile PresetsTM, and WeatherSense are trademarked by or registered trademarks of Humminbird. 2005 Humminbird, Eufaula AL, USA. All rights reserved.

Sonar X-Press Menu

Sensitivity. 21 Upper Range (Advanced: Sonar, Split Sonar, Big Digits and Circular Flasher Views only). 22 Lower Range. 23 Chart Speed. 24

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Zoom Level (Sonar Zoom view only). 24 Bottom Lock. 25 Bottom Range (Sonar Zoom View only, when Bottom Lock is On). 25
Depth Offset (Advanced). 44 Temp Offset (Advanced). 44 Speed Calibration (Advanced, with Temp/Speed only). 45

Sonar Menu Tab

Troubleshooting
Fish ID+. 27 Fish ID Sensitivity. 28 Real Time Sonar (RTS) Window. 28 Bottom View. 29 Zoom Width. 29 Depth Lines (Advanced). 30 Surface Clutter (Advanced). 31 Noise Filter (Advanced). 32 Max Depth (Advanced). 32 Water Type (Advanced). 33
100 Series Doesnt Power Up. Series Defaults to Simulator with a Transducer Attached. 46 Display Problems. 47 Finding the Cause of Noise. 48
Specifications Glossary Contact Humminbird

Alarms Menu Tab

Depth Alarm. 35 Fish ID Alarm. 35 Low Battery Alarm. 36 Temp Alarm. 36 Alarm Tone. 37

Setup Menu Tab

Units - Depth. 39 Units - Temp (International only). 39 Units - Distance (with Temp/Speed). 39 Units - Speed (with Temp/Speed). 40 User Mode. 40 Language (International only). 40 Triplog Reset (with Temp/Speed). 41 Restore Defaults. 41 Select Views (Advanced). 42 Select Readouts (Advanced, Sonar view only). 43

NOTE: Entries in this Table of Contents which list (International only) are only available on products sold outside of the US by our authorized International Distributors. To obtain a list of authorized International Distributors, please visit our website at www.humminbird.com or contact our Customer Resource Center at 1-800-633-1468 to locate the distributor nearest you. NOTE: Entries in this Table of Contents which list (with Temp/Speed) require the purchase of a separate accessory. You can visit our website at www.humminbird.com to order this accessory online or contact our Customer Resource Center at 1-800-633-1468.

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How Sonar Works
Sonar technology is based on sound waves. The 100 Series Fishing System uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer. Your 100 Series Fishing System sends a sound wave signal and determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off of an object; it then uses the reflected signal to interpret location, size, and composition of an object. Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than 1/4 of a second. It is unlikely that your boat can "outrun" this sonar signal. SONAR is an acronym for SOund and NAvigation Ranging. Sonar utilizes precision sound pulses or "pings" which are emitted into the water in a teardropshaped beam. The sound pulses "echo" back from objects in the water such as the bottom, fish and other submerged objects. The returned echoes are displayed on the LCD screen. Each time a new echo is received, the old echoes are moved across the LCD, creating a scrolling effect.
The sound pulses are transmitted at various frequencies depending on the application. Very high frequencies (455kHz) are used for greatest definition but the operating depth is limited. High frequencies (200kHz) are commonly used on consumer sonar and provide a good balance between depth performance and resolution. Low frequencies (83kHz) are typically used to achieve greater depth capability.
The power output is the amount of energy generated by the sonar transmitter. It is commonly measured using two methods: Root Mean Square (RMS) measures power output over the entire transmit cycle. Peak to Peak measures power output at the highest points. The benefits of increased power output are the ability to detect smaller targets at greater distances, ability to overcome noise, better high speed performance and enhanced depth capability.
When all the echoes are viewed side by side, an easy to interpret "graph" of the bottom, fish and structure appears.

Single Beam Sonar

Your 100 Series Fishing System uses a 200 kHz Single Beam sonar system with a 20 area of coverage. The 20 beam is focused on the bottom, to show you structure, weeds and cover.

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Whats On the Display
The 100 Series Fishing System can display a variety of useful information about the area
Depth - water depth; can be set to alarm when the water becomes too shallow.
under and adjacent to your boat, including the following items:
High Sonar Intensity Return Bait Ball Thermoclines - layers of water with different temperatures that appear at different depths and different times of the year. A thermocline typically appears as a continuous band of many colors moving across the display at the same depth.
Temperature - water surface temperature.
Timer - Elapsed time with Temp/Speed Accessory. Distance - Distance traveled with Temp/Speed Accessory. Average Speed - Average speed reading with Temp/Speed Accessory.
Speed - if a Temp/Speed accessory is attached, the FishFinder can display the speed of the boat. Second Sonar Return - when the sonar signal bounces between the bottom and the surface of the water and back again. Use the appearance of the second return to determine bottom hardness. Hard bottoms will show a strong second return, while soft bottoms will show a very weak one or none at all.
Fish - the FishFinder displays fish as arches and/or fish icons, and can be set to alarm when a fish of a certain size is detected. When a target is detected, a Fish ID+TM symbol appears on the display with the depth displayed above it. The size of the symbol indicates the intensity of the sonar return. The unit will clearly show schools of Bait Fish as "clouds" of different shapes and sizes, depending on the number of fish and boat speed. 200 kHz Orange Fish Symbol Structure - where fish may be hiding.
RTS (Real Time Sonar) Window
Low Sonar Intensity Return
NOTE: Entries in this view that list (with Temp/Speed) are available only if the device is connected
to the 100 Series Fishing System.

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The views available on your 100 Series Fishing System are: Sonar View Zoom View Big Digits View Circular Flasher View. Sonar View is the default view. When the VIEW key is pressed, the display cycles through the available views. When the EXIT key is pressed, the display cycles through the available views in reverse order. Any view can be hidden or displayed as part of the view rotation using the Views Menu tab.

Bottom Presentation

As the boat moves, the unit charts the changes in depth on the display to create a profile of the Bottom Contour. The type of bottom can be determined from the return charted on the display. A Hard Bottom such as compacted sediment or flat rock appears as a thinner line across the display. A Soft Bottom such as mud or sand appears as a thicker line across the display. Rocky Bottoms have a broken, random appearance.
Bottom Contour Profile with RTS Window. Temp/Speed Accessory is optional.
Real Time Sonar (RTS) Window
A Real Time Sonar (RTS) Window appears on the right side of the display in the Sonar View only. The RTS Window always updates at the fastest rate possible for depth conditions and shows only the returns from the bottom, structure and fish that are within the transducer beam. The RTS Window plots the depth and intensity of a sonar return (see Sonar Menu - RTS Window).
The Narrow RTS Window indicates the sonar intensity through the use of colors. Red indicates a strong return and blue indicates a weak return. The depth of the sonar return is indicated by the vertical placement of the return on the display depth scale. The Wide RTS Window indicates the sonar intensity through the use of a bar graph. The length of the plotted return provides an indication of whether the return is weak or strong. The depth of the sonar return is indicated by the vertical placement of the return on the display depth scale.
Hard Bottom Soft Bottom Rocky Bottom
The sonar returns from the bottom, structure and fish can be represented as either WhiteLine or Structure ID. See Sonar Menu Tab: Bottom View for details on how to set the bottom view.

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Structure ID represents weak returns in blue and strong returns in red.

Sonar Zoom View

Sonar Zoom View increases the displayed resolution to separate sonar returns that are very close together, such as those caused by fish suspended close to the bottom or within structure. In Zoom View, the display is split to show a narrow slice of the full range view on the right and the zoomed view on the left. The full range view on the right also contains the Zoom Preview Box that shows what part of the full range view is shown in zoom view on the left; the Zoom Preview Box tracks the bottom in the full range view. As the depth changes, the zoomed view updates automatically to display a magnified image of the bottom. The Zoom Preview Box shows where the zoomed view is in relation to the full range view. The Zoom Level, or magnification, is displayed in the lower left corner and can be changed to suit conditions (see Sonar X-PressTM Menu: Zoom Level). Upper and Lower Zoom Depth Range numbers indicate the depth of the water which is being viewed. Digital depth is displayed in the upper left hand corner. The digital readouts in the Sonar Zoom View cannot be customized; therefore, information such as water temperature and voltage are unavailable in the Sonar Zoom View.

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MENU Key
The MENU key is used to access the menu system. Start-Up Options Menu - Press the MENU key during the power up sequence to view the Start-Up Options menu. X-Press Menu - Press the MENU key once for the Sonar X-Press Menu. The X-Press Menu allows you to access frequently-used settings without having to navigate through the whole menu system. When the X-PressTM Menu is displayed, you can use the UP or DOWN Cursor keys to move to a particular menu choice. As soon as you alter a parameter (using the RIGHT or LEFT Cursor keys) the X-PressTM Menu will collapse temporarily, and the screen will update if it is affected by your menu setting change, allowing you to see the effects of your action immediately. Reactivate the X-PressTM Menu by using the UP or DOWN Cursor keys. Main Menu - Press the MENU key twice for the tabbed Main Menu System. The Main Menu System is organized under tabbed headings to help you find a specific menu item quickly: Alarms, Sonar and Setup tabs are part of your tabbed Main Menu System. Use the LEFT or RIGHT 4-WAY Cursor Control key to select a tab; then use the DOWN or UP key to select the menu item, and the LEFT or RIGHT key to alter a menu setting.

TM TM TM

EXIT Key
The EXIT key has multiple functions, depending on the situation: If an alarm is sounding, pressing EXIT will cancel the alarm. If a menu tab is selected, pressing EXIT will exit the menu mode and return to the view. If a menu is active, pressing EXIT will return to the previous level in the menu system. Pressing EXIT will cycle through the available views in reverse order.

P owering Up the Unit

Turn on your 100 Series Fishing System by pressing the POWER/LIGHT key. The Title screen is displayed until the Fishing System begins operation. Your Fishing System will begin Normal or Simulator operation, depending on the presence or absence of a transducer.

4-WAY Cursor Control Key

The 4-Way Cursor Control Key has multiple functions, depending on the situation: Use the DOWN or UP arrow keys to select a menu choice from the menu list, then use the LEFT or RIGHT arrow keys to change a menu setting.
NOTE: Menu choices are implemented and saved immediately - no further action is required.

141c Title Screen

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The Menu System

The menu system is divided into easy-to-use menu modules. The main components of the menu system are: Start-Up Options Menu - Press the MENU key during the power up sequence to view the Start-Up Options menu. X-PressTM Menu - The X-PressTM Menu allows you to access the settings that are changed frequently without having to navigate through the whole menu system. Press the MENU key once to display the X-PressTM Menu. When you select a menu item from the X-PressTM Menu, the menu will collapse, leaving only the menu choice on the screen. Use the Up or Down Cursor keys to reactivate the X-PressTM Menu.

Simulator

Use the Simulator to learn how to use your 100 Series Fishing System before taking your boat on the water. The Simulator is a very powerful tool that simulates on the water operation, providing a randomly-updated display. We recommend going through this manual while using the Simulator, since all of the menus function and affect the display the way they actually do when in Normal operation.
NOTE: To get the full benefit of the Simulator, it is important to select Simulator manually from the Start-Up Options menu as opposed to letting the Fishing System enter Simulator automatically (as it will if a transducer is not connected and you do nothing during power up). Manually selecting Simulator from the Start-Up Options menu allows you to preconfigure your 100 Series Fishing System for on the water operation. Any menu changes you make will be saved for later use.
A message will appear on the display periodically to remind you that you are using the Simulator. Exit the Simulator by powering your Fishing System off.
See the following paragraphs for more information about each of these choices.

Normal Operation

Use Normal operation for on the water operation with a transducer connected. In addition, your 100 Series Fishing System uses advanced transducer detection methods to determine if a transducer is connected. If a functioning transducer is connected, Normal operation will be selected automatically at power up and your Fishing System can be used on the water. Exit Normal operation by powering your Fishing System off.

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System Status
Use System Status to view system connections and to conduct a unit self-test. The following screens are displayed in turn when you press the VIEW button when using System Status: Self Test
System Status Self Test Screen

Sonar X-PressTM Menu

The Sonar X-PressTM Menu provides access to the settings most frequently-used. Press the MENU key once while in any of the Sonar Views to access the Sonar X-PressTM Menu.
NOTE: Upper Range only appears in Advanced User Mode when in Sonar, Split Sonar, Big Digits and Circular Flasher Views. NOTE: Zoom Level only appears in Sonar Zoom View.

Accessory Test.

Self Test displays results from the internal diagnostic self test, including unit serial number, Printed Circuit Board (PCB) serial number, software revision, total hours of operation and the input voltage. Accessory Test lists the accessories connected to the system.

For example, if you are fishing in 60 feet of water but are only interested in the first 30 feet (surface to a depth of 30 feet) you should set the Lower Depth Range limit to 30. The display will show the 0 to 30 foot range, allowing you to see a more detailed view than you would see if the display went all the way to the bottom. NOTE: A minimum distance of 10 feet will be maintained between the Upper and Lower Range regardless of the manual settings entered.

Chart Speed

Chart Speed determines the speed at which the sonar information moves across the display, and consequently the amount of detail shown. A faster speed shows more information and is preferred by most anglers; however, the sonar information moves across the display quickly. A slower speed keeps the information on the display longer, but the bottom and fish details become compressed and may be difficult to interpret. Regardless of the Chart Speed setting, the RTS Window will update at the maximum rate possible for the depth conditions. Adjust Chart Speed to your personal preference. To adjust the Chart Speed: 1. Highlight Chart Speed on the Sonar X-PressTM Menu. 2. Use the LEFT or RIGHT 4-Way Cursor Control keys to increase or decrease the Chart Speed setting. (1-9, Ultra, where 1 = Slow, 9 = Fast, Ultra = Fastest, Default = 5)

(Sonar Zoom View only)

To adjust the Lower Range: 1. Highlight Lower Range on the Sonar X-Press Menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to increase or decrease the Lower Range setting. (AUTO, 10 to 600 feet, 3 to 240 meters [International Models only], Default = AUTO)
Zoom Level sets the magnification level for the Sonar Zoom View, and is only available on the X-PressTM Menu when the Sonar Zoom View is active. Use Zoom to increase the display resolution to separate sonar returns that are very close together. To adjust the Zoom Level: 1. Highlight Zoom Level on the Sonar X-PressTM Menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Zoom Level setting for the Sonar Zoom View. (2x, 4x, 6x, 8x, Default = 2x)
NOTE: The Zoom Preview Box tracks the bottom and cannot be moved by the user.

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Bottom Lock
Press the MENU key twice to access the Main Menu System and then press the RIGHT Cursor key to select the Sonar tab.
NOTE: Menu choices will vary depending on system settings such as whether the unit is set for Advanced User mode.
Bottom Lock changes the mode of the Zoomed view in the Sonar Zoom View. Bottom Lock continuously graphs the bottom at a constant point on the display regardless of changes in depth. This "flattens" out the bottom contour, but is effective at showing fish on or near the bottom. To turn on Bottom Lock: 1. In the Sonar Zoom View, highlight Bottom Lock on the Sonar X-Press Menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Bottom Lock setting to on. (Off, On, Default = Off)

RTS Window (Wide)

RTS Window (Narrow)

RTS Window (Off)

To change the RTS Window setting: 1. Highlight RTS Window on the Sonar main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the RTS Window setting. (Wide, Narrow, Off, Default = Wide)

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Bottom View
Bottom View selects the method used to represent bottom and structure on the display. Structure ID represents weak returns in blue and strong returns in red. WhiteLine highlights the strongest sonar returns in white resulting in a distinctive outline. This has the benefit of clearly defining the bottom on the display (See Bottom Presentation for more information). To adjust the Bottom View: 1. Highlight Bottom View on the Sonar menu. 2. Use the LEFT or RIGHT 4-Way Cursor Control keys to change the Bottom View setting. (Structure ID, WhiteLine, Default = Structure ID)

Depth Lines

(Advanced)
Depth Lines divide the display into four equal sections which are separated by three horizontal depth lines. The depth of each line is displayed along the depth scale. You can either turn Depth Lines On or Off. The Depth Lines menu choice is available when User Mode is set to Advanced (see Setup Menu Tab: User Mode).

Zoom Width

Zoom Width adjusts the width of the Zoom window on the Sonar Zoom View. To change the Zoom Width Setting: 1. Highlight Zoom Width on the Sonar main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Zoom Width setting. (Narrow, Medium, Wide, Default = Wide) To change the Depth Lines setting: 1. Make sure you are in Advanced User Mode, then highlight Depth Lines on the Sonar main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to turn the Depth Lines setting On or Off. (Off, On, Default = On)

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Surface Clutter

Noise Filter

Surface Clutter adjusts the filter that removes surface clutter noise caused by algae and aeration. The lower the setting, the less surface clutter will be displayed. The Surface Clutter menu choice is available when User Mode is set to Advanced (see Setup Menu Tab: User Mode).
Noise Filter adjusts the sonar Noise Filter to limit interference on the display from sources such as your boat engine, turbulence, or other sonar devices. The Noise Filter menu choice is available when User Mode is set to Advanced (see Setup Menu Tab: User Mode).
NOTE: The Off setting removes all filtering; Low, Medium and High settings add progressive filtering of the sonar returns. In some deep water situations, the High setting may actually hinder your units ability to find the bottom.
To change the Noise Filter setting: 1. Make sure you are in Advanced User Mode, then highlight Noise Filter on the Sonar main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Noise Filter setting. (Off, Low, Medium, High1, High2, High3, Default = Low)

Alarms Menu

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Depth Alarm

Depth Alarm sounds when the depth becomes equal to or less than the menu setting. To change the Depth Alarm setting: 1. Highlight Depth Alarm on the Alarms main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Depth Alarm setting. (OFF, 1 to 100 feet, or 0.5 to 30 meters [International Models Only], Default = OFF)

Low Battery Alarm

Low Battery Alarm sounds when the input battery voltage is equal to or less than the menu setting. The battery alarm will only sound for the battery that is connected to the 100 Series Fishing System. The Low Battery Alarm should be set to warn you when the battery voltage drops below the safety margin that you have determined. For instance, if you are running a trolling motor (battery operated), you would want to set the Low Battery Alarm to sound before the battery voltage drops too low for it to be used to start your main, gasoline-powered engine. To change the Low Battery Alarm setting: 1. Highlight Low Battery Alarm on the Alarms main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Low Battery Alarm setting. (Off, 8.5V - 13.5V, Default = Off)

Fish ID Alarm

Fish ID Alarm sounds when the Fishing System detects fish that correspond to the alarm setting. Fish ID Alarm will only sound if Fish ID+TM is on.
For example, if you've set the Fish ID Alarm to sound for Large fish only, the Fish ID alarm will sound when a large-sized fish is detected.

Temp Alarm

Temp Alarm sounds when the water temperature detected by the 100 series reaches the Temp Alarm setting, which is either set in degrees Fahrenheit or Celsius [International Models Only]. For example, if the Temp Alarm is set to 58 degrees Fahrenheit, and the water temperature falls from 60 degrees to 58 degrees, the Temp Alarm will sound. Similarly, if the water temperature rises from 56 degrees to 58 degrees, the Temp Alarm will also sound. To change the Temp Alarm setting: 1. Highlight Temp Alarm on the Alarms main menu. 2. Use the LEFT or RIGHT 4-Way Cursor Control keys to change the Temp Alarm setting. (Off, 33-120 [Fahrenheit], 0-50 [Celsius], Default = Off)
To change the Fish ID Alarm setting: 1. Highlight Fish ID Alarm on the Alarms main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Fish ID Alarm setting. (Off, All, Large/Medium, Large, Default = Off)

Off Large Large/Medium All

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Alarm Tone

Alarm Toneselects the pitch of the alarm sound. A brief tone will be produced as you adjust the Alarm Tone so that you can select the tone that you can hear best. To change the Alarm Tone setting: 1. Highlight Alarm Tone on the Alarms main menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Alarm Tone setting. (High, Medium, Low, Default = Medium)
From any view, press the MENU key twice to access the tabbed Main Menu System, then press the RIGHT cursor key until the Setup tab is selected.
NOTE: Menu choices will vary depending on system settings such as whether the unit is set for Advanced User mode, whether it is an International model, or whether a Temp/Speed accessory is currently connected.

Setup Menu

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Units - Depth

Units - Depth selects the units of measure for all depthrelated readouts. To change the Units - Depth setting: 1. Highlight Units - Depth on the Setup menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Units - Depth setting. (Meters [International Models only], Feet, Fathoms; Default is Meters for International models, and Feet for Domestic models)

Units - Speed

(with Temp/Speed)
Units - Speed selects the units of measure for speed-related readouts, and will appear in the menu if a Temp/Speed Accessory is connected and the paddlewheel has moved at least once. To change the Units - Speed setting: 1. Highlight Units - Speed on the Setup menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Units - Speed setting. (kph [International Models only], mph, kts, Default = kph for International models and mph for Domestic models)

Units - Temp

(International only)
Units - Temp selects the units of measure for all temperature-related readouts [International Models Only]. To change the Units - Temp setting: 1. Highlight Units - Temp on the Setup menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Units - Temp setting. (Celsius, Fahrenheit; Default = Celsius)

User Mode

User Mode sets the menu system to either Normal or Advanced. When set to Normal (default setting), only the basic menu options are shown. When set to Advanced, additional menu choices are available. To change the User Mode setting: 1. Highlight User Mode on the Setup menu. 2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the User Mode setting. (Normal, Advanced, Default = Normal)

NOTE: Humminbird verifies maximum stated depth in saltwater conditions, but actual depth performance may vary due to transducer installation, water type, thermal layers, bottom composition and slope. NOTE: Product specifications and features are subject to change without notice.

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Cone Angle: The cone angle is the angular measurement of the sonar beam at a specific dB down point (i.e. -10 dB). See dB Down Point. Customizable Digital Readouts: Customizable Digital Readouts is a Humminbird feature that permits the user to select the specific digital information that appears in the main Sonar view (i.e. Speed, Temperature, Barometric Pressure, TripLog, etc.) Dead Zone: The dead zone is the area of the sonar beam that is received after the main bottom return. Fish and other objects close to the bottom that fall within the dead zone will probably not be visible in the sonar beam. Precision sonar beams, such as the Humminbird 20 beam, have a smaller dead zone than wider sonar beams. Decibel: A Decibel is the measurement for sound pressure level, or "intensity" of the sonar return. See dB Down Point. dB Down Point: The dB Down Point is the standard decibel level at which the sonar cone angle is measured, and is written as "@ -10 dB" or "@ -3 dB". Measurements at smaller down points (bigger negative numbers) indicate that the less intensive sonar signals are being used for the measurement. Display, FSTN: FSTN is an acronym for Film Super-Twist Nematic. FSTN is a monochrome display technology characterized by black, high-contrast pixels. All monochrome fixed mount Humminbird products use FSTN technology. DualBeam PLUS: DualBeam PLUS is a Humminbird sonar configuration that uses two sonar beams simultaneously, and combines the information from both beams into one view by overlapping the data on-screen, or shows each beam individually side by side, or permits each beam to be viewed individually full screen. Feature Memory: Feature Memory is a Humminbird feature that retains the user's menu settings in permanent memory. Settings are retained even when the unit is powered off indefinitely. Fish Arch: A Fish Arch is the apparent "arch" that appears on the display when any object moves through the sonar cone. The arch results from a gradual decrease in distance to an object as it moves into the sonar cone. The distance to an object changes due to the conical shape of the sonar beam, which causes the distance to be greater at the edges of the beam than at the center of the beam. When this distance change is graphed on the display, an arch appears. Fish ID+: Fish ID+ is a Humminbird feature that uses advanced sonar processing algorithms to determine if a detected object is likely to be a fish. When the sonar signal 51
from an object meets strict parameters, the unit draws a Fish Symbol (or icon) and the digital depth of the target. On DualBeam and DualBeam PLUS units, fish detected in the narrow center beam are shown as shaded symbols, and fish detected in the wider beam are shown as hollow symbols. Fish Symbol: A Fish Symbol is the graphic that is displayed on the screen when Fish ID+ determines that a sonar return is likely to be a fish. See Fish ID+. Freeze Frame: Freeze Frame is a Humminbird feature that pauses the sonar scrolling so that the image on screen can be studied with greater detail. See Instant Image Update. Frequency: Frequency is a measure of the number of sound wave cycles per second of a sound impulse transmitted underwater. A typical frequency for fishfinders is 200 kHz, which offers a good balance of performance under many conditions. Lower frequencies, such as 50 kHz, are capable of penetrating to greater depths, but with less resolution. Higher frequencies, such as 455 kHz, offer greater resolution, but are limited in depth performance. Humminbird uses a variety of frequencies that are optimized for specific applications. Grayscale: Grayscale is the use of varying shades of gray to represent the strength of the sonar signal on the display, and is a very intuitive method of presenting information. Traditionally, the strongest sonar signals are represented in black, and progressively weaker signals are represented in progressively lighter shades of gray. Grayscale, Inverse: Inverse Grayscale is a Humminbird feature that reverses the correlation of sonar signal strength and the shade of gray typically used to represent it. The strongest sonar signals are represented by "white", and progressively weaker signals are represented in progressively darker shades of gray. While somewhat counter-intuitive, this method makes the sonar images crisper, and has the benefit of enhancing the apparent sensitivity because the weaker signals appear bolder. Inverse grayscale works well in very clear water. Debris-laden water often appears as a lot of clutter on the screen. Instant Image Update: Instant Image Update is a Humminbird feature that updates all the sonar information on the display when Sensitivity and a variety of sonar settings (Bottom View, Range, etc.) are modified. This differs from the traditional functionality that only updates the new sonar information collected after the setting change. Instant Image Update permits more accurate fine-tuning of the display because the user can see the results on the complete sonar graph. When combined with the Freeze Frame feature, the user can adjust and understand the effects of many different sonar settings quickly and easily. 52

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Second Return: The Second Return is a term that describes the appearance of a second sonar return below the primary sonar return (bottom contour) at exactly twice the true depth. The second return is caused by the same sonar energy bouncing off the bottom once, rebounding to the water surface and then traveling back down to the bottom to be reflected again. Second returns are more common in shallow water and over hard bottoms; it is actually possible to see a third sonar return under some circumstances. The second return provides useful information to help determine bottom hardness, as areas with harder bottoms will generally create a second return. The second return can be used as a guide to set Sensitivity when in shallower water. Sensitivity: Sensitivity is a user feature that adjusts the sensitivity of the sonar system to show more or less detail in the water. Higher sensitivities are often preferred; however, when the water contains debris (silt, storm debris, etc.) it can be difficult to pick out targets. Conversely, if sensitivity is set too low, relevant targets may be missed. SONAR: SONAR is the acronym for SOund and NAvigation Ranging. Sonar technology uses precision sound bursts transmitted underwater to determine the distance and other attributes of objects in the water. Distance can be determined because the speed of sound in water is constant, and the time for the signal to return is measured. Sound also travels very quickly underwater, making sonar a responsive, cost-effective tool. Sonar is the basic technology behind all recreational and commercial fishfinding and depthfinding devices. Sonar Echo Enhancement: Sonar Echo Enhancement is a Humminbird feature that describes the high degree of sonar sensitivity achieved through a combination of transmitter/receiver and software algorithms. The result of Sonar Echo Enhancement is to display virtually everything in the water that is of interest to the angler, including bait fish, game fish, thermoclines, weed beds, subtle structure, and more. Sonar Update Rate: Sonar Update Rate is the number of times per second that the transmitter/receiver sends and receives sonar signals. A very fast sonar update rate collects more information and provides a more detailed image of the bottom, fish and structure. Many Humminbird units operate at up to 40 times per second when in single frequency operation. Due to the limitation of the speed of sound in water, the update rate begins to slow as depth increases to deeper than 50 feet. In very shallow water (less than 10 feet), however, update rates as much as 60 times per second can be achieved. Speed: Speed is the rate at which the boat moves through the water. Boat speed can be measured as Speed Over Ground or Speed Through Water. Speed Over Ground is provided by GPS, and is the measurement of the boats progress across a given distance. 55

Speed Through Water is provided by a speed paddlewheel, and is the measurement of the flow past the boat, which may vary depending on current speed and direction. Speed Through Water is most critical for anglers using downriggers, as it impacts the running depth of the down riggers. Speed Over Ground is optimal for navigation, as accurate destination times can be derived from this measurement. Humminbird products allow for input and display of both sources. Structure: Structure is a general term for objects on the bottom that present a discontinuity and are a likely attractor for fish. This includes bottom contour features (drop-offs, humps, and holes), standing structure (stumps, timbers, brush piles) and a wide range of other potential objects (sunken boats, reefs). Humminbird units excel at showing structure with great detail over a wider area due to unique sonar configurations developed for the angler. Structure ID: Structure ID is a Humminbird feature that describes the traditional grayscale method of presenting sonar information. See Grayscale. Surface Clutter: Surface Clutter is a phenomenon where sonar returns are reflected off of tiny objects near the surface of the water, including algae and even air bubbles. Typically, saltwater environments have significantly greater surface clutter than freshwater due to continuous wind and wave action that causes aeration at the surface. The Surface Clutter menu provides manual control to bias the default settings under extreme conditions. Target Separation: Target Separation is the measurement of minimum distance that a fishfinder needs to be able to recognize two very close objects as two distinct targets (i.e. two fish hanging very close, or a fish hanging very close to structure). Humminbird fishfinders provide a very good 2 1/2 inches of target separation in shallower than 100 feet of depth. Target separation decreases as depth increases due to the need for a longer Pulse Width to achieve greater depth. See Pulse Width. Thermoclines: Thermoclines are water layer(s) of distinctly different temperatures that create a sonar reflection due to the density of the differing water temperatures. Typically a thermocline will appear as a continuous band across the display at some distance above the bottom contour. Thermoclines are of interest to anglers because fish will suspend above or below the thermocline as they seek the optimum temperature and oxygen levels. Time Variable Gain: Time Variable Gain is a processing step applied to the sonar return to "normalize" the data so that objects of equal size (i.e. fish) appear to be the same size, even if they are separated by a good distance. Time Variable Gain is a fundamental attribute of good sonar. 56