Raymarine L750 Operating Handbook

Raymarine l750 fishfinder: user guide
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Summary of Contents for Raymarine L750

  • Page 1 Distributed by Any reference to Raytheon or RTN in this manual should be interpreted as Raymarine. The names Raytheon and RTN are owned by the Raytheon Company.
  • Page 2 L750 Fishfinder Operation Handbook Raymarine...
  • Page 4: Table Of Contents

    Contents Contents Chapter 1: Introduction ... 1 About the L750 Fishfinder ... 1 System Components ... 1 Standard Equipment ... 1 Standard Transducers ... 2 Optional Accessories ... 2 Chapter 2: Installation ... 4 About the Transducer ... 4 Selecting the Correct Type of Transducer ... 5 Installing a Thru-Hull Transducer ...
  • Page 5 Zoom Soft Key ... 44 Bottom Lock Soft Key ... 47 A-Scope (Bottom Coverage) Key ... 49 Other Control Buttons ... 50 Display ... 50 Gain/ Sensitivity ... 50 Range ... 52 VRM ... 53 Multi-purpose ... 54 L750 Fishfinder: Installation and Operation Handbook...
  • Page 6 Chapter 5: Maintenance and Troubleshooting ... 69 Cleaning Instructions ... 69 Troubleshooting Suggestions ... 69 Servicing a Thru-Hull Transducer ... 73 How to Contact Raymarine ... 73 Parts Listing ... 75 Chapter 6: Specifications ... 78 General Information ... 78 Fishfinder Functions ...
  • Page 7 Fig. 3-4 Fig. 3-5 Fig. 3-6 Fig. 3-7 Fig. 3-8 L750 Fishfinder: Installation and Operation Handbook Transducer Types ... 4 Thru-Hull Transducer ... 6 Best Transducer Locations ... 8 Installing a Fairing Block ... 9 Mounting the Transducer Correctly ... 11 Assembling the Transducer Bracket ...
  • Page 8 Contents Fig. 3-9 Fig. 3-10 Zoom Feature On ... 45 Fig. 3-11 Zoom Soft Keys ... 46 Fig. 3-12 Bottom Lock Display ... 48 Fig. 3-13 Bottom Lock Soft Keys ... 48 Fig. 3-14 Downlook Page with A-Scope ... 49 Fig.
  • Page 9 L750 Fishfinder: Installation and Operation Handbook...
  • Page 10: Chapter 1: Introduction

    • determine whether the seabed is hard or soft • measure the speed of the boat and the distance traveled • show the water temperature We are sure you will find the L750 Fishfinder to be one of the most useful devices on your boat. System Components The L750 Fishfinder consists of a compact display unit connected to a transducer.
  • Page 11: Standard Transducers

    Transducer adapter cable DC power cable Instruction manual Quick reference guide Standard Transducers Depending on which model of the L750 you have purchased, the box will include one of the transducers listed below: Description Transom-mount transducer (with speed and temperature sensors, including...
  • Page 12 Transom-mount speed and temperature sensor (used with depth-only transducers M78922, M78928, M78946) Replacement transom transducer mounting bracket kit Transducer switch box (select between two L750 Fishfinder displays, using one transducer) Replacement paddle wheel kit (for transom- mount transducer) Replacement paddle wheel kit (for thru-hull transducer) Note: Refer to page 75 for a list of repair parts.
  • Page 13: Chapter 2: Installation

    The transducer is very important to the operation of the Fishfinder. It is also important that you mount the transducer correctly. The transducer L750 Fishfinder: Installation and Operation Handbook...
  • Page 14: Selecting The Correct Type Of Transducer

    Chapter 2: Installation will give the most reliable readings if it looks into water which is smooth and undisturbed. If you place the transducer so bubbles or turbulence flow across the face of the unit, the system may give inaccurate readings.
  • Page 15: Installing A Thru-Hull Transducer

    This unit may be used with a thru-hull transducer. Please read this section completely before starting the installation. Normally, this type of installation is performed by a professional. Fig. 2-2 Thru-Hull Transducer L750 Fishfinder: Installation and Operation Handbook 3.13" dia. (79 mm) 5.24"...
  • Page 16: Before You Begin The Installation

    If you are in any doubt about this kind of installation, consult your boat representative or your Raymarine dealer. A set of installation instructions will be packaged with each transducer. These will give you more detailed information than we can include here.
  • Page 17: Mounting The Fairing Block

    Follow these instructions if you are installing the thru-hull transducer. The transducer should aim straight down (within 10°). If the bottom of the hull is sloped more than this, a fairing block may be necessary to L750 Fishfinder: Installation and Operation Handbook Sailboats thru hull...
  • Page 18: Fig. 2-4 Installing A Fairing Block

    Chapter 2: Installation keep the transducer perpendicular to the waterline. A fairing block which can adjust for angles of up to 25° is available from Raymarine. 1. Measure the deadrise angle of the hull at the selected mounting point. 2. Cut the block to a shape which fits the exact contour of the hull. The cut-out portion can be mounted inside the hull to provide additional support for the transducer once it is mounted.
  • Page 19: Installing A Thru-Hull Transducer

    Allow some time for the wood to swell after the vessel is put in the water. 8. Remove any excess sealant from the outside of the unit to assure smooth water flow over the transducer. L750 Fishfinder: Installation and Operation Handbook...
  • Page 20: Assembling The Transducer Bracket

    Chapter 2: Installation 9. As soon as the boat is placed in the water, check for leaks. Check again within 3 to 5 hours. (You may not be able to see a small leak right away.) If there are any leaks, you must repeat the installation procedure.
  • Page 21: Positioning The Transom-Mount Transducer

    • If the boat will be carried on a trailer, be sure the transducer will not hit any rollers, bunks or fittings on the trailer. Fig. 2-7 Transducer Mounted on Transom L750 Fishfinder: Installation and Operation Handbook...
  • Page 22: Mounting The Transom-Mount Transducer

    Chapter 2: Installation Allow a clearance of at least 10 inches (254 mm) Fig. 2-8 Transducer Bracket, Side View Mounting the Transom-Mount Transducer Follow these instructions if you are installing the transom-mount transducer. 1. On a boat with a fiberglass hull, the leading edge of the transducer should extend 1/8"...
  • Page 23: Fig. 2-9 Correct Mounting Position

    The bow of the transducer is above the bottom of the transom, creating cavitation. Fig. 2-9 Correct Mounting Position L750 Fishfinder: Installation and Operation Handbook Vertical transom – place wedge this way 2 to 5 2 to 5 Rivets on the hull are creating bubbles.
  • Page 24: Mounting The Optional Sidelooker Transducer

    Chapter 2: Installation Insert screws 1 and 3 1/4" from the bottom of slots, and screw 2 1/4" from the top of the slot to allow room for adjustment. If screws are inserted this way, it won’t be possible to make the height adjustment.
  • Page 25: Installation Notes - In-Hull Transducer

    4. Do not try to compensate for the angle of the hull by fairing the epoxy adhesive on the face of the transducer. 5. Use the epoxy supplied with the in-hull transducer, or an equivalent L750 Fishfinder: Installation and Operation Handbook...
  • Page 26: Installation Notes - Trolling Motor Transducer

    • The power for the display unit should be supplied from a different battery than the one used to start the engine. If the voltage to the Fishfinder unit drops below +10.7V DC, this could cause the unit to reset. This will not damage the equipment, but it may cause the loss...
  • Page 27: Fig. 2-12 Suppression Ferrites

    • Use only genuine Raymarine cables. During the installation, do not cut the transducer cable or remove the connector. Do not try to shorten or splice the cable. The transducer cable includes several wires, along with shielding and insulation.
  • Page 28: Mounting The Display Unit

    Chapter 2: Installation Mounting the Display Unit – Standard Mount You may mount the display unit on any flat surface using the bracket supplied. See Fig. 2-13. (There is also an optional kit which allows you to flush-mount the display in a flat panel or dashboard). Follow these instructions if you are using the standard mounting bracket: 1.
  • Page 29: Fig. 2-14 Flush-Mount Installation

    Fit the display into the cutout again. From the rear, screw the nuts securely onto the threaded studs to hold the unit in place. L750 Fishfinder: Installation and Operation Handbook 9mm (0.35 in) maximum...
  • Page 30: Installing The Transducer Cable

    4. If the 20 foot transducer cable is not long enough, a 15 foot extension cable (5M) is available from your Raymarine dealer (part no. M99- 139). When you attach the extension cable, be sure that the connections are tight and watertight. Use Dow Corning DC-4 or an equivalent sealing compound to protect the connector assemblies.
  • Page 31: Sidelooker Option

    Important! The L750 Fishfinder is sometimes used with the Raymarine SL70 “Pathfinder” radar display. The two units have the same case design. Each unit has a large connector on the rear of the case. On the radar unit, this connector is used to bring in the radar signals.
  • Page 32: Installation With Separate Speed And Temperature Sensors

    Installation with Separate Speed and Temperature Sensors 1. Optional depth-only and speed- and temperature-only transducers are available for the L750 Fishfinder. In this optional configuration the separate transducers are connected via a “Y” type receptacle cable located on the optional speed- and temperature-only transducer cable.
  • Page 33 DC power lines all the way back to the battery. If the polarity is not correct, reconnect the leads properly and try again. L750 Fishfinder: Installation and Operation Handbook...
  • Page 34: Calibrating The Sensors

    These sensors are normally very accurate, but you may want to calibrate them. The speed indication on your Fishfinder is usually very accurate. However, there are some special cases where the speed reading may be high or low. This means that the speed of the water past the transducer may not be the same speed that your boat moves through the water.
  • Page 35 4. The temperature sensor is usually very accurate, but you can adjust the calibration using the entry for “Temp Cal.” Final note: After you finish the installation, please remember to fill out the Warranty Card included with this manual. L750 Fishfinder: Installation and Operation Handbook...
  • Page 36: Chapter 3: Operating Instructions

    Chapter 3: Operating Instructions Chapter 3: Operating Instructions In this section of the manual, we will explain how to operate the unit. (Setup instructions are detailed in the next Chapter.) Below you will find some short descriptions of the controls on the display unit. We have included more detailed descriptions in the following sections.
  • Page 37: Soft Keys

    Downlooker display. The standard Downlooker display is a “top-down” view, as if it was seen from the surface of the water. The Bottom Lock display shows a “bottom-up” view. The bottom is used as the reference, L750 Fishfinder: Installation and Operation Handbook...
  • Page 38 Chapter 3: Operating Instructions and is shown as a straight line. Echoes from objects directly above the bottom are indicated on the display. A-Scope The Soft Key for the A-Scope feature appears on the main Downlooker display. The A-Scope feature presents a “real time” display of the area under the boat.
  • Page 39: Turning The Power On And Off

    Turning the Power On and Off Turning the Power On – Initial Use When you turn on the power to the Fishfinder for the first time, the unit will ask you for some set-up information. This only happens once. The unit will present a list of languages. The displays and set-up information for the unit will be presented in the language you choose.
  • Page 40: Turning The Power On - Routine Operation

    Chapter 3: Operating Instructions To make a choice, move through the list using the up- and down-controls on the Trackpad. (This is the large circular control near the lower right corner of the unit.) When the language you want is highlighted, press the small Enter button at the bottom of the unit.
  • Page 41: Setup Memory And Master Reset

    On a unit with the optional “Sidelooker” feature, is one more basic page, for a total of four. For more information, see the section on “Using the Optional Sidelooker Feature.” Fig. 3-2 Display Soft Keys L750 Fishfinder: Installation and Operation Handbook Function Standard operating mode, good general coverage of bottom...
  • Page 42: Downlook Page

    “standard” or “chart” or “bottom graph” display.) As time passes, this display scrolls from right to left. The scrolling image becomes a record of the echoes and the bottom seen by the Fishfinder as your boat moves.
  • Page 43 5 - Alarm indicators The Fishfinder has alarms which can be set to sound when the unit detects a depth less than a pre-set limit (“S” symbol - shallow alarm), or greater than a pre-set limit (“D” symbol - deep alarm).
  • Page 44 Chapter 3: Operating Instructions 6 - Transducer frequency The transducer can use two frequencies - 50 kHz for wide coverage, or 200 kHz for a detailed view. You can also set the unit to use both frequencies at the same time (“dual frequency”). (For more on this, see “Choosing the Frequency.”) 7 - Boat symbol This symbol is always turned on.
  • Page 45 This indicates the depth of the bottom directly under the boat. You can select FT (feet), FA (fathoms), or M (meters) using the System Setup display. If the Fishfinder can’t tell how deep the water is, the last known depth flashes on the display. This will continue until the unit can see the bottom again.
  • Page 46: Fish Indications

    The body of a fish is just a little more dense than the surrounding water. There is really nothing very solid for the sound waves to bounce off of. The L750 Fishfinder is very good at telling the difference between a fish and the surrounding water.
  • Page 47: Bottom Indications

    In Fig. 3-5b, the Fishfinder is getting a good echo from the bottom, so the upper layer of the bottom is shown as a dark gray area. Notice that the lower layer of the bottom is shown as a lighter gray area.
  • Page 48: Window Page

    Chapter 3: Operating Instructions the sound waves may reach through this layer, and may be reflected by a more solid layer below. It is also possible that the sound waves are making two complete trips – hitting the bottom, bouncing off of the bottom of the boat, then reflecting off the bottom again.
  • Page 49: Fig. 3-6 Window "A" Page

    This item is a graph showing the changes in water temperature over time. Fig. 3-6 Window “A” Page L750 Fishfinder: Installation and Operation Handbook Depth, speed, battery, temperature graph Depth, speed, log, temperature graph Depth, speed, log, temperature, battery Downlooker display with Sidelooker display...
  • Page 50: Digital Page

    Chapter 3: Operating Instructions This entry shows the distance traveled, determined by the speed through the water. The L750 remembers this value after it is turned off. You may reset the log by pressing Menu and using the Log Reset Soft Key.
  • Page 51: Modifying Displays

    This is the speed of the boat through the water. This entry shows the distance traveled, determined by the speed through the water. The L750 remembers this value after it is turned off. You may reset the log by pressing the Soft Key for Menu and using the Log Reset Soft Key.
  • Page 52: Fig. 3-9 Split Frequency Feature

    Chapter 3: Operating Instructions 50 kHz frequency When using this frequency, the transducer can scan a wide area. The 50 kHz signal penetrates water well, so it is good for use in deep water. 200 kHz frequency When using this frequency, the transducer scans a narrower area, but produces a more detailed view.
  • Page 53: Zoom Soft Key

    Zoom Soft Key. See Fig. 3-11. You can choose an x2 view (double the normal display size), x4, x6 or x8. You must also select the area or “window” of the water you want to zoom. See the next item. L750 Fishfinder: Installation and Operation Handbook...
  • Page 54: Fig. 3-10 Zoom Feature On

    The number at the bottom shows the depth at the bottom of the zoomed area. When the Fishfinder is set for Auto Zoom, it will choose the zoom area automatically. The unit always chooses an area of the water which includes the bottom.
  • Page 55: Fig. 3-11 Zoom Soft Keys

    Zoom area, see the beginning of this section.) Zoom x2468 This Soft Key allows you to set the Zoom magnification. Press the Soft Key until the magnification you want is highlighted. L750 Fishfinder: Installation and Operation Handbook...
  • Page 56: Bottom Lock Soft Key

    Chapter 3: Operating Instructions Bottom Lock Soft Key The normal display on the Fishfinder is a “top-down” view, as if it was seen from the surface of the water. When the Bottom Lock feature is turned on, the unit shows a “bottom-up” view. The bottom is used as the reference, and echoes from objects directly above the bottom are displayed.
  • Page 57: Fig. 3-13 Bottom Lock Soft Keys

    Next, use the up- and down- controls on the Trackpad to set the Bottom Lock Range. (Do not use the Range button for this.) Fig. 3-13 Bottom Lock Soft Keys L750 Fishfinder: Installation and Operation Handbook...
  • Page 58: A-Scope (Bottom Coverage) Key

    A-Scope (Bottom Coverage) Key On the Downlook display, the bottom graph is “drawn” after the Fishfinder receives several echoes. This has the effect of showing a record of the bottom contour. The A-scope displays raw sonar data directly from the transducer beam. This gives you a “real time” image of fish and bottom structure directly below the transducer.
  • Page 59: Other Control Buttons

    “background noise.” Use a higher sensitivity setting for deeper water, and a lower setting for shallower water. L750 Fishfinder: Installation and Operation Handbook Standard display Standard display with digital info.
  • Page 60 Go to the Soft Key for the 50kHz or 200 kHz setting, and adjust the gain as you would normally. (See the information on the next two soft keys.) When the Fishfinder is turned off, then on again, the Auto sensitivity setting will return to the normal or default setting.
  • Page 61: Range

    Figure 3-16 shows the Soft Keys which allow you to set the range. Range Auto/Manual When you first press the Range button, the Fishfinder asks you to set the range manually. Use the upper or lower parts of the Range button to decrease or increase the range.
  • Page 62: Vrm

    Chapter 3: Operating Instructions Here is a list of the possible range settings In feet: In fathoms: In meters: Note – If the Sidelooker feature is turned on, there is an extra Soft Key which allows you to set the range for the Sidelooker. See Section 4. Fig.
  • Page 63: Multi-Purpose

    If this happens, you can reset the whole unit to the factory default settings. Turn the unit on by pressing the Power button and the Enter button at the same time. Fig. 3-18 Multi-Purpose Soft Keys L750 Fishfinder: Installation and Operation Handbook...
  • Page 64: Alarms

    Chapter 3: Operating Instructions Alarms The Fishfinder has two kinds of depth alarms, and an alarm which is triggered when fish are present. The Alarm button allows you to set these alarms. When you press the Alarm button, the unit will present the four Soft Keys shown in Fig.
  • Page 65: Fish Alarm

    If you choose the setting for Alarms + Keys, the buzzer will also sound a short “beep” each time you press one of the buttons on the control panel. This confirms that you have pressed the button hard enough, and that the unit has received your command. L750 Fishfinder: Installation and Operation Handbook...
  • Page 66: Mark

    Chapter 3: Operating Instructions When the Buzzer entry is set to Off, the buzzer is silenced for all of the alarms. Once you choose this option, if a shallow alarm, deep alarm or fish alarm occurs, the “S” or “D” symbol will flash, but the buzzer will not sound.
  • Page 67: About The Sidelooker Feature

    See Fig. 3-22. When you press the Display button, a fourth Soft Key allows access to the Sidelooker page Fish Fish Sidelooker transducer Fig. 3-21 Sidelooker Feature L750 Fishfinder: Installation and Operation Handbook Rock 31 beam Boat Rock 11 beam aimed down at 4 angle...
  • Page 68: The Sidelooker Page

    Chapter 3: Operating Instructions Centerline Bottom or river bank echoes Fish image Depth below boat Fig. 3-22 Sidelooker Page The Sidelooker Page The Sidelooker page, like the Standard page, displays a graph or chart. As new echoes are received by the Sidelooker transducer, the chart scrolls from the top to the bottom of the display.
  • Page 69 If you have selected meters (M), the distance shown here will be in meters. Depth This is the depth directly below the boat. Even when the Sidelooker feature is turned on, the downward-looking transducer is still used to measure the depth. L750 Fishfinder: Installation and Operation Handbook...
  • Page 70: The Split-Screen Sidelooker Page

    Downlook page.) You must set the range for the Sidelooker feature manually. (If the bottom rises or falls when Manual Range is selected, the Fishfinder will not adjust for this.) Sidelooker display...
  • Page 71: Setting The Sidelooker Gain/Sensitivity

    Manual Gain is selected (due to changing depth or water conditions), the Fishfinder will not adjust for this. The Fishfinder can also be set to select the gain for the Sidelooker feature by itself, automatically. Use the Soft Key to select the Auto Gain function.
  • Page 72: Chapter 4: Setup Instructions

    Fig. 4-1 Menu Soft Keys Chart Speed Setting Most of the displays on the Fishfinder show a record of the signals the unit has received. The new information appears at the right edge of the display. The older information moves toward the left of the display. (If the Sidelooker screen is displayed, the new information appears at the top and moves toward the bottom.) The chart speed adjustment sets...
  • Page 73: Log Reset

    Chart Speed setting. Use the up- and down-controls on the Trackpad to change the setting. Making the bar longer increases the chart speed. If you move the bar all of the way down, the Fishfinder will “freeze” and hold the current display. (The depth indicator will continue to update.) Log Reset The “log”...
  • Page 74: Fig. 4-3 System Setup Menu

    Chapter 4: Setup Instructions Fig. 4-3 System Setup Menu Here are the items on this menu: Simulator This unit has a built-in simulator. When the simulator is enabled, it presents a realistic display. You can use this display to learn about the features of the unit without operating your boat.
  • Page 75: White Line

    2°F too high, you can correct for this by setting Temp Cal to -2.0°. The setting can range between -9.9° and +9.9°. Use the left- and right-controls to change the value. L750 Fishfinder: Installation and Operation Handbook...
  • Page 76: Depth Digits

    Chapter 4: Setup Instructions Depth Digits This item sets the size of the digits used to show the bottom depth on the Standard and Dual displays. The “standard” setting specifies digits which are 9 mm tall, and the “large” setting calls for digits which are 18 mm tall.
  • Page 77: Resetting The Unit To Factory Defaults

    Resetting the Unit to Factory Defaults It is easy to reset all of the settings on the Fishfinder to the original factory settings. When the unit is off, press and hold the Enter key while pressing the Power key. The unit will display the message, “EEPROM initialization.
  • Page 78: Chapter 5: Maintenance And Troubleshooting

    If the unit is not working correctly, there may be a simple cause. Before you call for service help, please check these points: The Fishfinder display unit will not turn on – 1. The unit may actually be operating, but the contrast may have been...
  • Page 79 This may reveal the cause of the problem. Move the Fishfinder, the other unit, or the wiring. A movement of just a few inches can make a big difference. If it is necessary to cross any wires, make the crossing at a right angle.
  • Page 80 (#320 grade or finer), but this will affect the performance of the unit when the boat is moving at higher speeds. 7. If the Fishfinder is using the Auto Sensitivity setting, it may be reacting to an increase in electrical “noise.” As the level of noise increases, the sensitivity automatically adjusts, and the unit can lose its ability to see the bottom or fish.
  • Page 81 2. The Fishfinder will not display arches unless the boat is moving. If the boat is stopped, fish will appear on the display as straight lines. 3. The transducer may not be aimed straight down. In order to display complete arches, the transducer must be vertical.
  • Page 82: Servicing A Thru-Hull Transducer

    Raymarine unit. You may also reach our Technical Support Department via the Internet. Questions may be addressed directly to: techsupport@raymarine.com Or, you may visit the Raymarine World Wide Web site : www.raymarine.com For accessories and parts Please call 1-800-539-5539, extension 2333 or (603) 881-5200 extension 2333.
  • Page 83 Raymarine dealer. However, if you are in need of an item not available through your retailer, please contact the Customer Service Department. The Customer Service Department is available Monday through Friday, 8:15 a.m. to 5:00 p.m. Eastern Time. Please have the Raymarine part number ready when calling to place an order.
  • Page 84: Parts Listing

    Chapter 5: Maintenance and Troubleshooting Parts Listing Key No. Part Front facia (consisting of 1a - 1f) Blanking plate Blanking plate seal Window Window gasket Front cover Light guide (green ring) Keypad mat - lower Keypad mat - upper Note - See page 2 for a list of accessories and options. Part No.
  • Page 85 Key No. Part Keypad PC board - upper LCD module Case seal Keypad PC board - lower L750 Fishfinder: Installation and Operation Handbook Part No. R113 R069 R070 R068 Qty.
  • Page 86 Chapter 5: Maintenance and Troubleshooting Key No. Part Washers (part of 2) Rear cover Main PC board assembly Part No. Qty. W095 G625706-1...
  • Page 87: Chapter 6: Specifications

    M (meters) Zoom size Chart speed White line Alarms L750 Fishfinder: Installation and Operation Handbook 7" FSTN high-contrast LCD with 4 levels of gray 5.5" H (140 mm) x 4.2" W (105 mm) 320 x 240 Adjustable, with temperature compensation...
  • Page 88: Connector Diagram

    Numerical display Water temperature Boat speed units Sensitivity Connector Diagram Fig. 6-1 Connector Diagram (Viewed from rear of L750 chassis) Pin no. 0 to 999 units 8 sizes 500 W(rms) 50 kHz, 200 kHz or dual operation 200kHz: 16° @ -6db 50kHz: 65°...
  • Page 89: Dimensions

    L750 Fishfinder: Installation and Operation Handbook GAIN DISPLAY VRM/EBL MARKS MULTI ALARMS RANGE POWER ENTER CLEAR MENU Fig. 6-2 Dimensions...
  • Page 90: Glossary Of Terms

    Glossary Glossary of Terms Aft: Background noise: False or meaningless echo returns produced by Bow: Cavitation: Chart Speed: Cursor: Deadrise angle: Default value: Fairing block: Fathom: Frequency: Fore: Gain: Keel: Near or toward the rear part of the boat (nautical term).
  • Page 91 Sensitivity: Starboard: Statute mile: Stern: Thermocline: L750 Fishfinder: Installation and Operation Handbook “Kilo-Hertz” – a measure of frequency (For example, 200 kHz = 200,000 oscillations per second.) A bracket which is installed on the transom of a boat and holds the transducer in place. When the transducer strikes an obstruction, it is designed to release or “kick up”...
  • Page 92 Glossary Transducer: Transom: White Line: Zoom: A device which sends and receives high frequency sound waves through the water. The rear-most part of the boat’s hull, often a flat panel. A feature used to help display fish near the bottom. This feature helps to show the difference between weak returns (including fish near the bottom) and strong returns (including the bottom itself).
  • Page 93 (auto mileage and tolls) up to 100 round trip highway miles (160 kilometres) and travel time of 2 hours, will be assumed by Raymarine only on products where proof of installation or commission by authorized service agents, can be shown.

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