Garmin GPSMAP 235 Sounder Owner's Manual
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Garmin GPSMAP 235 Sounder Owner's Manual

Garmin GPSMAP 235 Sounder Owner's Manual

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OWNER'S MANUAL
AND REFERENCE
GPSMAP 235
TM
Sounder

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  • Page 1 OWNER’S MANUAL AND REFERENCE GPSMAP 235 Sounder...
  • Page 2 GARMIN. Information in this document is subject to change without notice. GARMIN reserves the right to change or improve its products and to make changes in the content without oblig- ation to notify any person or organization of such changes or improvements.
  • Page 3 Warning The GPSMAP 235 Sounder should not be used as a navigational aid or depth sounder to prevent collision, grounding, or boat damage, any of which could result in personal injury. For reasons of safety, we also recommend that you operate your boat at very slow speed if you suspect shallow water or submerged objects.
  • Page 4 (NAVAID), any NAVAID can be misused or misinterpreted and, therefore, become unsafe. Use the GPSMAP 235 Sounder at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Owner’s Manual—and thoroughly practice operation using the simulator mode prior to actual use. When in...
  • Page 5 Designed for detailed electronic charting and complete depth sounding capabil- ity, the GARMIN GPSMAP 235 Sounder is a powerful navigation device that also gives you the fishfinding information you need in fresh or saltwater. Precision Performance: • High-contrast, four-level gray, LCD screen •...

  • Page 6: Limited Warranty

    GARMIN warrants this product to be free from defects in materials and manu- facture for one year from the date of purchase. GARMIN will, at its sole option, repair or replace any components which fail in normal use. Such repairs or replace- ment will be made at no charge to the customer for parts or labor.
  • Page 7 This manual is broken down into two parts for your convenience. Part One introduces you to the GPSMAP 235 Sounder and provides a “getting started tour” so that you may become more familiar with the unit. This section will provide you with a basic working knowledge of the sounder.
  • Page 8 Before installing and using with your sounder, please check to see that your package includes the following items. If any parts are missing, please contact your GARMIN dealer immediately. *Standard Package: • GPSMAP 235 Sounder • External GPS Antenna and 30’ cable • Power/Data Cable • Mounting and Gimbal Bracket •...

  • Page 9: Table Of Contents

    Appendix A: ......90-94 GPSMAP 235 Sounder Installation Appendix B: ......95-97 Wiring and Specifications Appendix C: .

  • Page 10: Getting Started

    INTRODUCTION Keypad Usage The GPSMAP 235 Sounder’s advanced keypad system is designed to allow for fast, con- venient selection of navigation options and data entry. The getting started tour will introduce you to the keypad and provide a ‘hands-on’ lesson in using the sounder.
  • Page 11 Initializing the Receiver Before you use your GPSMAP 235 for the first time, you’ll need to “initialize the receiver.” Initialization is the process in which the receiver collects satellite data and establishes its (your) present position. Follow the initialization process described below, which will usually provide a position fix in about a minute.
  • Page 12 GETTING STARTED Initialization A. Use the arrow keypad to move the cursor to a location close to your present position. B. Hollow signal strength bars will appear on the Status Page while the receiver collects satellite data. Initializing the Receiver (con’t.) The Map Page will appear, prompting you to select your approximate present posi- tion with the map cursor.
  • Page 13 Getting Started Tour The GARMIN GPSMAP 235 Sounder is a powerful electronic navigation and depth sounding system that provides detailed chart coverage and convenient con- trol of many advanced features right from the screen display. This tour is designed to take you through the basic pages and functions of the system using the simula- tor mode.
  • Page 14 GETTING STARTED Status Page/Simulator Mode A. To start the simulator, confirm the simulator warning. Do not use simulation for actual navi- gation or to determine actual water depth. B. Whenever the sounder is in simulator mode, a ‘Setup Simulator?’ option will appear on the options menu for each page.
  • Page 15 The satellite Status Page is one of five main pages used in the sounder. All five pages are linked together in a simple chain, which allows you to scroll through the pages in either direction using the J and Q keys. To continue the tour, let’ s move on to the next page, the position page.

  • Page 16: Marking A Position

    GETTING STARTED GETTING STARTED Using the GOTO Key Marking a Position A. The mark position page will automatically assign a default, three-digit name for each waypoint, which can be changed at any time to an alphanu- meric name containing up to six-characters. B.
  • Page 17 Thermocline Whiteline The Sounder Page lets you use the GPSMAP 235 as a fishfinder. The top of the screen contains any of seven selectable data field options, while the middle of the page contains a right-to-left moving sonar image of the water beneath your boat.
  • Page 18 GETTING STARTED Range Modes A. When switching between auto and manual modes, the range scale will be highlighted. B. The depth of the waypoint is captured with the underwater waypoint feature. Range Modes The unit uses three range modes on the Sounder Page: auto, manual, and win- dow.
  • Page 19 Zoom Feature The zoom feature allows you to view a smaller portion of the complete range in greater detail. The zoom feature operates in auto or manual mode. Auto zoom will follow the bottom contour while manual zoom will display the selected depth. For more on the zoom feature, see pages 26-27.
  • Page 20 GETTING STARTED Map Page A. The map/sounder split screen displays cartography and sounder information at the same time. The split screen only functions as a map page, and any changes to the sounder display must be made from the Sounder Page. Use the QUIT or PAGE key to quickly switch between the map split-screen and the Sounder Page.

  • Page 21: Map Cursor

    Using the Map Cursor The cursor is an important tool that can be used to pan to other map locations, mark and edit waypoints and routes, and review position data of on-screen navaids and waypoints. To get a feel for using the Map Page and cursor, try the following exercise: 1.
  • Page 22 GETTING STARTED Using the GOTO Feature A. Pressing GOTO once displays a list of all waypoints stored in memory. To pick a destination, select the desired waypoint and press EDIT/ENTER. B. The GOTO options menu allows you to start a TracBack route back home, select a destination from the nearest waypoints list, or select a route to navigate.
  • Page 23 Going to a Destination (con’t.) A data field at the top of the page will now display the bearing and distance to the second route waypoint. To get started, let’ s enter a speed for our vessel, which we can do from the ‘Setup Simulator?’ listing on the map options menu. The setup simulator page is available from any page in the main page sequence.
  • Page 24 GETTING STARTED Reviewing and Creating Waypoints on the Map A. Waypoints can be created from the map display by moving the cursor to the desired position and press- ing the EDIT/ENTER key. B. The create new waypoint page will automatically assign the next available three-digit number as the default waypoint name.
  • Page 25 Navigation Page Compass Tape Graphic Highway Pointer to Waypoint The Navigation Page provides graphic steering guidance to your destination. The bearing (BRG) and distance (DIS) to the destination, with your current course (COG) and speed over ground (SOG), are displayed at the top of the page, along with a compass tape to indicate your cardinal heading.
  • Page 26 GETTING STARTED Using the Navigation Page A. To reset the simulator to steer the desired course automatically, select the ‘Auto COG’ setting from the options menu. B. The highway scale can be set to a 1/4-, 1/2-, 1-, 2-, or 4-nm/mi/km range with the ZOOM keys. Navigation Page (con’t.) To adjust the simulated boat speed: 1.
  • Page 27 Active Route Page The active route page shows each waypoint of the active route in sequence, with the waypoint name, distance and estimated time enroute to each waypoint displayed. As you navigate the route, the active route list will be automatically updated, indicating the next destination waypoint.
  • Page 28 Congratulations! You’ve now gone through the basic operation of the GARMIN GPSMAP 235 Sounder. Your new digital chartplotter is a powerful tool with many advanced features not covered in the Getting Started tour. For detailed instructions on using these features or performing a specific task, please refer to the quick refer- ence guide or the appropriate reference section of this manual.
  • Page 29 Status Page Status Field Horizontal Accuracy Dilution of Precision Status Bar The Status Page provides a visual reference of various receiver functions, including current satellite coverage, receiver operating mode and current receiver accuracy. The status information will give you an idea of what the receiver is doing at any given moment.
  • Page 30 SECTION STATUS PAGE Receiver Status A. The status bar at the bottom of the page displays important status, alarm and map scale informa- tion. It also provides on-screen user and message prompts. B. The status bar will display an anchor symbol or ‘PRX’...

  • Page 31: Section 2: Position

    Satellite Status Page Options The satellite Status Page features an options menu that provides access to func- tions and features relating to the Status Page. To display the Status Page options menu: 1. From the Status Page, press There are four options: •...
  • Page 32 SECTION POSITION PAGE Overview The trip odometer can be reset from the Position Page options menu. To reset the odometer, select the ‘Reset Trip Distance?’ option and press EDIT/ENTER. Position Page Compass Tape Time of Day The position page shows your position, direction, and speed. There is a graphic compass tape at the top of the page that shows the direction you’re heading (you have to be moving), and four selectable data fields: course over ground (COG), speed over ground (SOG), distance traveled (TRP) and altitude (ALT).
  • Page 33 Position Page Options The position page features an options menu that provides access to functions and features relating to the position page. To display the position page options menu: 1. Press There are four options: • Reset Trip Distance?: Resets the trip odometer (TRP) field to zero. •...

  • Page 34: Section 3: Sounder

    Whiteline Thermocline The Sounder Page is where your GPSMAP 235 becomes a powerful fishfinder. The top of the screen can display a maximum of seven selectable data field options, while the middle of the page displays a right-to-left moving sonar image of the water beneath your boat.
  • Page 35 Range Modes The sounder features three depth range modes: auto, manual, and window. Auto is the default setting and continually adjusts the screen display to show the maximum amount of detail possible, while always showing the bottom; manual allows you to adjust the sonar display’ s depth using the R keypad; window lets you establish a starting depth (top) and length (span) for the sonar display.
  • Page 36 SECTION SOUNDER PAGE Zoom Feature A. The 4X full display screen shows the original picture at four times the detail. B. For dual frequency operation (in this example 200 kHz/50 kHz), the bottom half of the screen shows the original picture at the original viewing depth, at the bottom frequency (50 kHz).
  • Page 37 Zoom Window Depth Scale Once a zoom window is displayed, it’ s depth scale can be adjusted. A hollow indicator bar is displayed to the left of the depth scale on the original picture (top half of the screen). The depth scale of the zoom window corresponds to the range set by the indicator bar.
  • Page 38 SOUNDER PAGE SECTION Map/Sounder Split Screen A. The split screen display is activated from the Map Page. B. In the split screen mode, the Map Page is fully functional but the Sounder Page is for viewing purposes only. Map/Sounder Page Split Screen The sounder can display a split screen view of the sounder window and Map Page.
  • Page 39 The following options are available: • Sensitivity Adjust?: Sensitivity controls the sounder’s ability to show echoes without introducing interference. With Garmin’s technology called Depth Controlled Gain, you will rarely have to manually adjust the sensitivity. Under actual operating condi- tions, DCG automatically adjusts the sensitivity for the best setting. Under unusual...
  • Page 40 SOUNDER PAGE SECTION Whiteline, Chart Speed, Range Mode A. The whiteline value is changed from the options menu which is accessed from the Sounder Page. B. Chart speed is adjustable from 10% to 100% in increments of ten. Sounder Page Options (con’t.) •...
  • Page 41 Sounder Page Options (con’t.) Auto is the default setting and continually adjusts the screen display to show the maximum amount of detail possible, while always showing the bottom. Manual allows you to adjust the sonar display’ s depth using the R keypad. Window lets you establish a starting depth (top) and length (span) for the sonar display.
  • Page 42 SOUNDER PAGE SECTION Data Fields and Restore Defaults A. The Sounder Page can be configured to display up to five data fields simultaneously. B. Any of thirteen information options may be shown in a designated data field. Sounder Page Options (con’t.) •...
  • Page 43 Highlight the ‘Sounder Setup?’ option and press • Fish ID: The Fish ID determines how the GPSMAP 235 Sounder identifies and labels sonar targets on the viewing screen. The ‘On’ and ‘Fish Only’ settings display fish symbols on the screen in place of actual target echoes.
  • Page 44 SOUNDER PAGE SECTION Fish ID and Water Temperature Setup A. The digital depth of each fish symbol will be displayed when target depth is turned on. B. There are three water temperature options. Sounder Setup Page (con’t.) To select Fish ID: 1.
  • Page 45 “pitch” of the sound that the transducer sends and receives. Typically, low frequencies (50 kHz) provide the deepest readings. High frequencies (200 kHz) provide better res- olution and detail. The dual frequency modes of the GPSMAP 235 combine low-and high-frequency operation which gives you the advantages of both.
  • Page 46 SOUNDER PAGE SECTION Transducer Frequency and Speed Calibration Setup A. The 200 kHz/50 kHz selection gives you maxi- mum depth readings with good bottom detail and resolution. B. Calibration is required if you are using a trans- ducer capable of displaying speed through the water.
  • Page 47 Sounder Setup Page (con’t.) To use Auto Calibration: 1. Ensure ‘Auto Calibrate?’ is displayed in the speed calibration field. If it is not, press to display the calibration menu. 2. Highlight ‘Auto Calibrate’ and press 3. Press again and an instruction message will appear. 4.

  • Page 48: Section 4: Map

    GETTING START- SOUNDER PAGE SECTION Speed Calibration and Simulator Setup Using the GOTO A. The ‘Setup Simulator?’ option is included in the options menu for each of the five main pages when in simulator mode. B. Each simulator data field may be modified to display user-selected values and navigational information.
  • Page 49 Map Page Boat Icon Status The Map Page provides a comprehensive display of electronic cartography, plotting and navigational data. The map display shows your boat on a digital chart, complete with geographic names, navaids, depth contours and other chart features. It also plots your track and displays any routes and waypoints you create. An on-screen cursor lets you pan and scroll to other map areas, determine the dis- tance and bearing to a position, and perform various route and waypoint functions.
  • Page 50 GETTING START- SECTION MAP PAGE Map Modes Using the GOTO A. Position mode on inland water cartography. B. Cursor mode on inland water cartography. Map Modes There are two map operating modes: the position mode and the cursor mode. When the map is in the position mode, the position marker pans the cartography to keep itself within the display area.
  • Page 51 Using the Cursor The cursor allows you to pan away from your present position and scroll to other map areas (even outside of your current G-chart coverage). As you pan past the edge of the current map display, the screen will actively scroll forward to pro- vide continuous map coverage.
  • Page 52 GETTING START- SECTION MAP PAGE Map Scales Using the GOTO A. Whenever the selected map scale exceeds the reso- lution of the chart by up to two settings, an ‘Ovr Zm’ warning will appear in the scale field. B. Whenever the selected map scale exceeds the reso- lution of the chart by more than two settings, a ‘No Map’...

  • Page 53: Getting Start

    Map Page Options The Map Page options menu provides access to many of the features and func- tions that will help you configure the Map Page to your own preferences. To display the Map Page options menu: 1. From the Map Page, press To select a menu option: 1.
  • Page 54 GETTING START- MAP PAGE SECTION Configure Map and Change Orientation Using the GOTO A. The map configuration grid allows you to define what items appear on the display at each map scale. B. To turn an entire row on for the selected map item, highlight the ‘Enable Row?’...
  • Page 55 Map Page Options (con’t.) From the map configuration page, you can also access another options menu by highlighting any of the items and pressing O •Enable or Disable a Row?: Allows you to turn an entire row on or off. To turn an entire row on or off: 1.
  • Page 56 GETTING START- MAP PAGE SECTION Map Colors, Restore Defaults, Page Display Using the GOTO A. The color option allows you to define the fill color (grayscale) of the land and water used on the map display. Three options are available: no color (no fills for land or water), gray land/white water (the default setting), and white land/gray water.
  • Page 57 Map Page Options (con’t.) The last two display options make it possible to display both the Map Page and Sounder Page simultaneously in a split screen arrangement. The top half of the page will show a reduced-size Map Page while the Sounder Page is displayed in the lower half of the screen.

  • Page 58: Section 5: Navigation

    GETTING START- MAP PAGE SECTION Data Fields, Restore Defaults, Setup Using the GOTO Simulator A. The Change Data Fields? option allows you to define what type of data is displayed in each data field of the Map Page. B. The default option resets all Map Page options to the factory settings.
  • Page 59 Navigation Page Compass Tape Graphic Highway Pointer to Waypoint Whenever a GOTO, MOB, TracBack or route has been turned on, the sounder will provide digital and graphic steering guidance to the destination with the Navigation Page. The top half of the Navigation Page features four user-selectable data fields that display the bearing (BRG) and distance (DIS) to waypoint, along with your current course (COG) and speed over ground (SOG).
  • Page 60 SECTION NAVIGATION PAGE Overview and Options A. To change the highway scale perspective, press the IN and OUT zoom keys. B. The Navigation Page options menu lets you config- ure the Navigation Page to your own preferences. As you head toward your destination, the highway perspective will move to indicate your progress to the waypoint and which direction you should steer to stay on course.
  • Page 61 Navigation Page Options (con’t.) The following options are available: • Change Data Fields?: Allows you to define the type of data that is displayed in any of the six user-selectable data fields. Thirteen options are available: • BRG • DIS •...

  • Page 62: Section 6: Main Menu

    GETTING START- SECTION MAIN MENU PAGE Overview Using the GOTO A. The waypoint category options on the main menu page are described in the waypoints section on pages 59-62. B. The routes category options are described on pages 66-69. Main Menu Page The main menu page provides access to various waypoint, system, navigation and interface management and setup menus.
  • Page 63 Creating and Using Waypoints The sounder stores up to 250 alphanumeric waypoints with user-defined sym- bols and comments available for each waypoint. Waypoints can be created using one of the following methods: • Mark Key: Although used primarily for marking your present position, the key also provides options that allow you to select a map or navaid position from the map display.
  • Page 64 GETTING START- SECTION WAYPOINTS Using the MARK Key Using the GOTO A. To create a waypoint at an on-screen navaid, move the cursor over the desired navaid. B. Press the MARK key and select the ‘Use Navaid Posn?’ option. Press EDIT/ENTER to finish. Mark Key (con’t.) The mark key can also be used on the Map Page to mark the cursor position or an on-screen navaid.
  • Page 65 Creating Waypoints Graphically Waypoints may also be quickly created from the map display, which allows you to ‘point and shoot’ at any map position and create a new waypoint. To create a new waypoint graphically: 1. Use the keypad to move the cursor to the desired map position. If you want to create the new waypoint at an on-screen navaid, highlight the navaid on the map display.
  • Page 66 GETTING START- SECTION WAYPOINTS Reference Waypoints Using the GOTO A. Enter the bearing from the reference waypoint to the new waypoint in the ‘BRG’ field. B. Enter the distance from the reference waypoint to the new waypoint in the ‘DIS’ field. Reference Waypoints A new waypoint can also be created by entering an existing waypoint’...
  • Page 67 Reviewing and Editing Waypoints Once you have created and stored a waypoint, it may be modified, reviewed, renamed or deleted at any time using the waypoint definition page. The waypoint definition page is accessed by highlighting the desired waypoint from the map dis- play or selecting it from waypoint or nearest waypoint list and pressing the T key.
  • Page 68 GETTING START- WAYPOINTS SECTION Waypoint Definition Page Options Using the GOTO A. To review or edit a waypoint on the map display, select the ‘Edit Wpt On Map?’ option. B. To move the selected waypoint, press EDIT/ENTER. Use the arrow keypad to select the new position, and press EDIT/ENTER to finish.
  • Page 69 Waypoint Submenus The sounder’ s main menu page features four waypoint submenus that let you manage a large number of waypoints quickly and efficiently. The submenus also provide a continuously updated nearest waypoints list and a proximity waypoint alarm function that can be used to define an alarm circle around submerged haz- ards, shallow waters, etc.

  • Page 70: Section 7: Waypoints

    GETTING START- SECTION WAYPOINTS Proximity Waypoints Using the GOTO A. Whenever you enter a proximity waypoint’s alarm circle, a ‘PRX’ indicator will appear in the status bar (the alarms option must be set to the ‘On’ position). Once you’ve left the alarm circle, the proximity indicator will automatically reset.
  • Page 71 Create Waypoint Submenu The third waypoint submenu accessible from the main menu page is the ‘Create Waypoint’ submenu, which allows you to create a new waypoint by manually entering coordinates. Instructions for using the ‘Create Waypoint’ submenu are provided on page 55. Waypoint List The last waypoint category available from the main menu is the waypoints list, which displays a master list of all waypoints currently stored in memory.
  • Page 72 GETTING START- GOTO/MOB SECTION Selecting a GOTO Destination Using the GOTO A. To select a destination from a list of waypoints, press GOTO once. B. Press GOTO twice to select a destination waypoint using the map cursor. If you are not selecting an existing waypoint as your destination, a new way- point named ‘MAP’...
  • Page 73 GOTO Options The GOTO options menu provides a list of additional GOTO options that let you start a TracBack route, select a destination waypoint from the nearest way- points list, select a route to navigate, or cancel the current GOTO destination. To display the GOTO options menu from any page: 1.

  • Page 74: Section 9: Routes

    GETTING START- GOTO/MOB SECTION MOB and TracBack Navigation Using the GOTO A. The sounder’s MOB feature can be used to set a course to a passing spot when a quick response to emergency situations, fish strikes, etc. is needed. B. To define a starting point for a TracBack route, first clear the track log.
  • Page 75 TracBack Navigation (con’t.) Once a TracBack has been turned on, the sounder will take the track log cur- rently stored in memory and divide it into segments called ‘legs’. Up to 30 tempo- rary waypoints (e.g. T001) will be created to mark the most significant features of the track log in order to duplicate your exact path as closely as possible.
  • Page 76 ROUTES SECTION Creating a Route Graphically A. The route options page provides access to the sounder’s route functions. B. Use the arrow pointer and EDIT/ENTER to add waypoints to the route. The create waypoint page will appear whenever you have selected a position that is not already stored as a waypoint.
  • Page 77 Routes (con’t.) Once a route has been created graphically (and the Q key has been pressed to finish), the map display will automatically enter the route review mode. The arrow pointer will be replaced by the map cursor, located at the last route waypoint. The route edit mode allows you to review and modify the route displayed through a pop-up window menu for each waypoint.
  • Page 78 GETTING START- SECTION ROUTES Route Edit Mode Using the GOTO A. A new route waypoint may be inserted into any route leg by pointing to the new waypoint or position and pressing EDIT/ENTER. B. The ‘Edit As Text?’ option allows you to review and modify waypoints by text entry.
  • Page 79 Routes (con’t.) To review the selected waypoint: 1. Highlight the ‘Review?’ option and press To insert a new waypoint before the selected route waypoint: 1. Highlight the ‘Insert?’ option and press 2. Enter the name of the new waypoint using the the new waypoint from the nearest list, waypoint list, or map display.
  • Page 80 GETTING START- SECTION ROUTES Route List Page Using the GOTO A. The route list page displays each route stored in memory, along with a 16-character user com- ment. The default comment is the name of the first and last route waypoint. B.
  • Page 81 Route List Page Options (cont.) • Clear Route: Allows you to clear all waypoints from the selected route. To clear the selected route: 1. Highlight the ‘Clear Route?’ option and press 2. Press to confirm the clear route warning. • Copy Route?: Allows you to copy the waypoints of a selected route to another route. The route copy function can be used to copy a TracBack route (route 00) to another route in order to prevent losing the route the next time a TracBack route is activated, or to save a modified version of an existing route without losing the original.
  • Page 82 GETTING START- SECTION ROUTES Active Route Page Using the GOTO Each waypoint on the active route page may be reviewed, deleted or changed right from the active route page. To edit an active route waypoint, highlight the desired waypoint and press EDIT/ENTER. Select the desired function from the pop-up menu and press EDIT/ENTER.
  • Page 83 Active Route Page Options The following options are available from the active route page: • Invert Route?: Activates the active route in reverse order and begins navigation. • Activate Route?: Reactivates the active route and selects the route leg closest to your current position as the new active leg.
  • Page 84 GETTING START- SECTION ROUTES Track Log Setup Using the GOTO A. The ‘Wrap’ option will continuously record a track log, and replace the oldest track log point with new data. The ‘Fill’ option will record a track log until the memory is full. B.
  • Page 85 Trip and Fuel Planning The trip and fuel planning submenu lets you plan and review distance, fuel, and ETE/ETA information between any two waypoints, your present position and a stored waypoint, or any part of a stored route. Sunrise and sunset information is also provided.
  • Page 86 GETTING START- SECTION ROUTES Route and Trip Planning Using the GOTO A. To plan cumulative totals for an entire route, select the ‘All’ option from the leg field. B. To plan cumulative totals through a particular leg, select the ‘Hold First Waypoint?’ option from the Trip and Fuel Planning options page.

  • Page 87: Section 10: Setup Menus

    Trip and Fuel Planning (cont.) To use the sunrise/sunset planner: 1. Highlight ‘Trip & Fuel Planning’ option from the main menu and press 2. Highlight the first waypoint field and press field, and use the keypad to enter the name of the desired waypoint. You may leave the waypoint field blank to use your present position, or press the waypoint from the nearest list, the waypoint list, or the map display.
  • Page 88 GETTING START- SETUP MENUS SECTION System Setup and System Using the GOTO Setup Options A. The ‘None’ tone setting will prevent an audible tone from sounding for any key presses, messages, or alarms. Regardless of the tone setting, ‘MESSAGE -PRESS PAGE’ will continue to be flashed on the status bar for any system messages or alarms.

  • Page 89: Setup Menus

    Navigation Setup The navigation setup submenu is used to select a variety of navigation informa- tion including: position format, units of measure, and heading references. This submenu is also used to select map datums, set the CDI scale and adjust the built- in velocity filter.
  • Page 90 SETUP MENUS Navigation Setup A. CAUTION! Using the incorrect map datum can seriously effect the accuracy of your GPS receiver. The GPS datum should always match the datum of the local chart you are using. If no datum informa- tion is indicated on the charts you are using, contact the chart manufacturer.
  • Page 91 Timers and Alarms Setup The timer and alarms submenu is used to control various alarm/timer settings. • Timer: Sounds an alarm when an entered interval (up to 99:59:59) has expired, or provides a continuous running clock timer to 99:59:59. To use the countdown timer: 1.
  • Page 92 •Data Transfer: A proprietary interface that allows you to exchange data such as way- points, routes and track logs between GPSMAP units or a GARMIN PC kit. •No In/NMEA Out: Provides navigation information to a compatible NMEA device such as an autopilot or radar.
  • Page 93 Using NMEA and DGPS Interface Settings If you are using an NMEA interface format, the NMEA format must be specified in the NMEA format field that will automatically appear when an NMEA option is selected. The appropriate baud rate will be set automatically. See page 96 for a list of NMEA supported sentences.
  • Page 94 G-CHARTS SECTION Installing and Removing G-Charts Installing and Removing G-Chart Cartridges The unit uses G-chart offshore or inland cartography to display digital charts on-screen. G-chart cartridges are installed in the card slot located at the bottom right of the unit. G-chart cartridges may be installed or removed at any time, whether the unit is on or off.
  • Page 95 Using G-Chart Cartography Once a G-chart cartridge has been inserted, the map coverage outlines for the cartridge will automatically appear on-screen. Keep in mind that the display will not automatically scroll to the map area or zoom to a level where you can see the coverage outlines.

  • Page 96: Section 12: Loran Tds

    LORAN C Basics SECTION LORAN TDs LORAN C is a radio navigation aid operated and maintained in the United States LORAN C Basics by the Untied States Coast Guard. The name LORAN is an acronym for "Long Range Navigation". The LORAN system covers the entire United States and the U.S.
  • Page 97 LORAN TD Feature The LORAN TD feature eases the transition from using LORAN to using GPS. The GPSMAP 235 Sounder automatically converts GPS coordinates to LORAN TDs for those who have a collection of LORAN fixes for favorite fishing spots and other- waypoints recorded as TDs.
  • Page 98 LORAN TDs SECTION Using the LORAN TD Position Display Format A. It is important to set the correct GRI Chain and secondary stations for the waypoint that you want to create. The GRI Chain and secondary station fields cannot be deleted on the Create Waypoints Page.
  • Page 99 Creating Waypoints in the LORAN TD Format Waypoints can be created graphically, using the Mark Key, and by Text Entry (see page 53). Waypoints can also be created using LORAN TDs. To create a waypoint using the LORAN TD Position Format: 1.

  • Page 100: Appendix A

    BNC connector. Sounder Installation The GPSMAP 235 Sounder must be properly installed according to the follow- ing instructions to get the best possible performance. The GPSMAP 235 Sounder is available both with and without a transducer and cable (the cable must be used for FCC compliance).
  • Page 101 Mounting the Sounder The unit’ s waterproof case is suitable for mounting in exposed locations or at the nav station. The unit comes with a gimbal bracket that can be used for surface or overhead mounting. When choosing a location for the unit, make sure you consider the following conditions: •...
  • Page 102 SECTION APPENDIX Installation GPSMAP 235 Mounting Template To flush mount the sounder: 1. Remove the four M5 screws from the back of the unit and remove the mounting bracket. 2. Using the mounting template provided in the box, determine where you wnat to mount the unit and tape the template in place.
  • Page 103 Figure 1-For thick mounting sur- faces, insert the M5 screws directly through the four drilled holes. Figure 2-For thin panels, place the mounting bracket on the back side of the panel for additional support. SECTION APPENDIX Installation...
  • Page 104 APPENDIX Installation Through-Hull Trolling Motor Garmin offers a variety of transducers for use with your Sounder. Detailed installation instructions for the transducer you have selected are included with the transducer. Proper placement and installation of the transducer are essential in the operation of the sounder portion of the unit.
  • Page 105 Connecting the Power/Data Cable The power/data cable connects the GPSMAP 235 to a 10-40 volt DC system and provides interface capabilities for connecting external devices, including an external alarm. The color code in the diagram below indicates the appropriate harness connections.
  • Page 106 Specifications DGPS corrections are accepted in RTCM-104 v. 2.0 format through the NMEA In (BROWN) har- ness lead. The GARMIN GBR 21 is the recom- mended beacon receiver for use with the GPSMAP 235 system. Other receivers with the correct...
  • Page 107 Usage: 10 watts max. Specifications subject to change without notice. * With optional GARMIN GBR 21 Beacon Receiver Input. ** Subject to accuracy degradation to 100m 2DRMS under the U.S. DOD-imposed Selective Availability Program. Note: For transducer specifications, see the...

  • Page 108: Appendix C

    SECTION APPENDIX Messages The GPSMAP 235 Sounder uses an on-screen message prompt to alert you to important informa- tion. Whenever a message appears, press the key to view the message. Alarm Clock—The alarm clock has sounded. Anchor Drag Alarm—You have drifted out of the specified distance range.
  • Page 109 Route Waypoint was Deleted—A route way- Waypoint Memory is Full—You have used all point entered does not exist in the database and 250 waypoints in the GPSMAP 235 Sounder sys- tem. has been deleted from the route. SECTION...

  • Page 110: Appendix D

    SECTION APPENDIX Map Datums The GPSMAP 235 Sounder’s built-in worldwide database includes chart coverage down to 64 nm (32 in U.S.) for the areas outlined above. Note that the database is only valid to 68º15’ of latitude. The maximum cursor latitude is 85º05’, and the maxi- mum waypoint latitude is 89º24.543 north or south.
  • Page 111 Corrego Alegr Corrego Alegre- Brazil Kerguelen Islnd Djakarta Djakarta (Batavia)- Sumatra Kertau 1948 Island (Indonesia) L. C. 5 Astro Dos 1968 Dos 1968- Gizo Island Liberia 1964 (New Georgia Islands) Luzon Mindanao Easter Isld 67 Easter Island 1967 Luzon Philippine European 1950 European 1950- Austria, Belgium,...

  • Page 112: D Map Datums

    SECTION APPENDIX Map Datums NAD27 Greenland North American 1927- Rome 1940 Greenland (Hayes RT 90 Peninsula) Santo (Dos) NAD27 Mexico N. American 1927- Mexico Sao Braz NAD27 San Salvadr North American 1927- San Salvador Island Sapper Hill ‘43 NAD83 North American 1983- Alaska, Canada, Central Schwarzeck America, CONUS, Mexico...
  • Page 113 Almanac Data: The satellite constellation information (including location and health of satellites) that is transmitted to your receiver from every GPS satellite. Almanac data must be acquired before GPS SECTION APPENDIX navigation can begin. Bearing (BRG): The compass direction from your position to a destination. Glossary Course Over Ground (COG): Direction of movement relative to a ground position.
  • Page 114 Thermocline— A layer of water separating warmer water above from cooler water below. SECTION APPENDIX Turn (TRN)— The difference and direction in degrees between the bearing to your destination and your course over ground. The TRN value is used to indicate what direction, and how many Glossary degrees, to turn to get back on course.

  • Page 115: Appendix F

    The chart below gives an approximate UTC time offset for the various longitu- dinal zones. Check with local charts for more detailed information. If you are in daylight savings time, add one hour to the offset. Longitudinal Zone W180.0º to W172.5º W172.5º...

  • Page 116: Appendix G

    SECTION APPENDIX Index 2D Navigation ......20 3D Navigation ......20 ccessories .
  • Page 117 Map Modes ......40 Map Orientation ..... . .44 Map Page .
  • Page 118 SECTION APPENDIX Index Simulated Boat Speed ....12 Simulated Boat Steering ....16 Simulating Navigation .
  • Page 119 GARMIN International, Inc.,1200 E. 151st Street, Olathe, KS 66062 USA GARMIN (Europe) Ltd., Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey SO51 9AQ UK GARMIN (Asia) Corp., 3F,. No. 1, Lane 45, Pao Hsing Road, Hsin Tien, Taipei, Taiwan R.O.C. Part Number 190-00138-10 Rev. B...

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