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Garmin SOUNDER 125 Owner's Manual & Reference

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  • Page 1 GPS 125 Sounder Marine Navigator ZOOM O w n e r ’ s M a n u a l & R e f e r e n c e...
  • 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 obligation to notify any person or organization of such changes or improvements.
  • Page 3 See your GARMIN dealer for accessories including our PC kit and standard or temperature reading in-hull and transom-mount transducers. Thanks for choosing the GARMIN GPS 125 Sounder. We hope it will help you meet all of your navigation and fishfinding needs.
  • Page 4 INTRODUCTION Caution The GPS system is operated by the government of the United States, which is solely responsible for its accuracy and maintenance. The system is subject to changes which could affect the accuracy and performance of all GPS equipment. Although the GPS 125 Sounder is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted and, therefore, become unsafe.

  • Page 5: Table Of Contents

    INTRODUCTION Table of Contents SECTION ONE Introduction Glossary/Navigation Basics ....... .2-4 SECTION TWO Getting Started Turning On and Initializing the Receiver .
  • Page 6 INTRODUCTION Glossary The GPS 125 Sounder is a powerful navigation tool that can guide you any- where in the world. To better understand its operation and capabilities, it may be helpful to review the basic terms and concepts briefly explained below. Other navigation and GPS definitions used in the manual are defined in the appropriate reference sections of the manual.
  • Page 7 Latitude The north/south measurement of position perpendicular to the earth’ s polar axis. Longitude An east/west measurement of position in relation to the Prime Meridian, an imagi- nary circle that passes through the north and south poles. Position An exact, unique location based on a geographic coordinate system. Sensitivity A measure of how sensitive the sounder is to sonar echoes.

  • Page 8: Glossary/Navigation Basics

    INTRODUCTION Navigation Basics The GPS 125 Sounder provides steering guidance and navigation information using degrees, a measurement mea- sured in a clockwise direction from a north reference. North is described as 000º, east as 090º, south as 180º, and west as 270º.
  • Page 9 Getting Started with Your GPS Welcome to the exciting world of GARMIN GPS! The GPS 125 Sounder represents GARMIN’ s continuing commitment to provide marine users with quality navi- gation information in a versatile, user-friendly design they will enjoy for years to come. To get the most out...

  • Page 10: Initializing The Receiver

    GETTING STARTED Initialization The EZinit prompt will automatically appear if the receiver needs to be initial- ized. The prompt may also appear during normal use if the antenna is shaded. Use the arrow keypad to highlight country, region, or state of your pre- sent position from the list and press ENTER.

  • Page 11: Initialization Troubleshooting

    2. Use the key to scroll through the list options until the country of your present position appears. 3. Use to highlight the country/state/region you’re in. If the country you’re in is not listed, select another country within 500 miles of your present position. 4.

  • Page 12: Primary Pages

    GETTING STARTED Primary Pages Satellite Page The Satellite Page will allow you to monitor satellite signal reception and strength. Sounder Page Primary Pages The GPS 125 Sounder uses six primary “pages” to give you information. The pages are arranged in a con- tinual loop and can be easily viewed in forward or reverse order by pressing either the J or Before we start the tour, let’...

  • Page 13: Navigation Page

    Map Page The Map Page acts as a window that allows you to view your position, the “path” you have traveled over, and nearby waypoints. A diamond icon in the center of the screen represents your present position. As you move, you will see a thin line, called a track log, appear along the path you have just covered.

  • Page 14: Marking A Waypoint

    Getting Started Tour Now that your GPS receiver has been initialized and you are familiar with the primary pages, it’ s time to take a tour. This is a live tour and is to be conducted with your unit installed and with the boat in the water.

  • Page 15: Map Page

    4. Press the key once to move the character highlight to the next character space. 5. Repeat steps 3 and 4 until the word ‘DOCK’ is shown. 6. Press to complete entry of the name. 7. Press the key twice to return the field highlight to the ‘SAVE?’...

  • Page 16: Going To A Waypoint

    GETTING STARTED Position/Map Pages and GOTO The moving map’s default screen orientation is track up orientation. “Track up” means that your current direction of travel is always up (or towards the top of) the screen. It can also be set for north up, or desired track orientation through the map setup page.

  • Page 17: Highway Page

    Using the Highway Page Bearing to Waypoint Current Track Destination Waypoint “Finish Line” Position Diamond Estimated Time Enroute Pointer to Waypoint The GPS 125 Sounder’ s Highway Page provides graphic steering guidance to a destination, with an emphasis on a straight-line course to the desired way- point and the distance and direction you are off course.

  • Page 18: Using The Sounder Page

    GETTING STARTED Highway/ Sounder Page & Cancelling GOTO The 125 Sounder will also provide steering guidance with a graphic Compass Page. To change the display from the Highway Page, press ENTER twice. Once a GOTO is activated, the GPS 125 Sounder pro- vides steering guidance until the GOTO is canceled.

  • Page 19: Sounder Zoom

    GETTING STARTED Sounder Page, Range Modes, & Sounder Zoom GARMIN’s exclusive See- Thru technology will allow you to distinguish sonar tar- gets from bottom clutter and thermoclines. Use the target cursor to mark the desired underwa- ter location.

  • Page 20: Sounder Zoom

    GETTING STARTED Sounder Zoom & Zoom Window Pressing the IN key once while on the Sounder Page activates the 2X Zoom. The zoom window may be moved at any time by using the arrow keypad. The zoom function is accessed by using the IN and OUT key when viewing the Sounder Page.

  • Page 21: Turning The Receiver Off

    Turning the Receiver Off You’ve now gone through the basic operation of your new GPS receiver and probably know a little more than you think about how it works. We encourage you to experiment with the GPS 125 Sounder until it becomes an extension of your own navigation skills.

  • Page 22: Satellite Page

    REFERENCE Satellite Page Overview When backlighting is on, a bulb icon will appear on the Satellite Page. Use the icon to determine if backlighting is turned on during daylight hours. Satellites being tracked but blocked from use (03,17) will be displayed in reverse video, with the correspond- ing signal strength bar hollow.

  • Page 23: Receiver Status

    Receiver Status and EPE Receiver status is indicated at the top left of the screen, with the current horizontal accuracy (estimated position error, in feet or meters) at the top right. The status will show one of the following conditions: Searching—...

  • Page 24: Position Page

    REFERENCE Backlighting & Position Page The speed and track dis- played on the Position Page may fluxuate at slow speeds (or when you’re standing still) because of position errors caused by Selective Availability. To reset the trip odometer, highlight the trip field and press ENTER.
  • Page 25 Marking and Saving Waypoints Knowing your present position is only part of any navigation equation. You also need to keep track of where you’ve been and where you are going. Waypoints serve as electronic markers that let you keep track of starting points, destinations, navaids and any other important position.

  • Page 26: Waypoints Page

    REFERENCE Nearest Waypoints Page To select a waypoint sub- menu, highlight the desired option and press ENTER. compass heading (BRG) and distance (DST) to the nine nearest way- points are updated continu- ously. Waypoint Submenus The GPS 125 Sounder has three waypoint submenu pages that let you manage a large number of waypoints quickly and efficiently.

  • Page 27: Waypoint List Page

    Waypoint List Page The waypoint list page provides you with a com- plete list of all waypoints currently stored in the GPS 125 Sounder. The total number of used and empty waypoints is indicated above the waypoint list. From the waypoint list page, you can retrieve a waypoint def- inition page, delete all user-defined waypoints, or go to a selected waypoint.

  • Page 28: Waypoint Definition Page

    REFERENCE Waypoint Definition Page Use the waypoint definition page to review, rename, or delete stored waypoints and to create new waypoints manually. To create a new waypoint by manually entering coor- dinates or by referencing an existing waypoint, highlight the ‘NEW?’ prompt and press the ENTER key.

  • Page 29: Reference Waypoints

    Reference Waypoints To create a new waypoint manually without know- ing its position coordinates, you’ll need to enter its bearing and distance from an existing waypoint. The GPS 125 Sounder will then calculate the position coor- dinates for you. To create a new waypoint by referencing a stored waypoint: 1.

  • Page 30: Waypoint Comments

    REFERENCE Editing,Deleting, & Renaming Waypoints The waypoint comment field will automatically dis- play the date and time of creation of the waypoint. You may replace this with a 16-character custom com- ment at any time. To access the rename func- tion from the waypoint def- inition page, highlight the ‘RENAME?’...

  • Page 31: Scanning Waypoints

    To rename a stored waypoint: 1. Highlight the ‘RENAME?’ field and press 2. Enter the new waypoint name and press 3. Press the key to confirm your changes. To delete a stored waypoint: 1. Highlight the ‘DELETE?’ field and press 2.

  • Page 32: Selecting A Goto Destination

    REFERENCE Starting/Stopping a GOTO & MOB Select a destination way- point from the GOTO way- point list. Once the MOB mode has been activated, steering guidance will be provided by the Highway or Compass Page. Activating another MOB will replace the previ- ous MOB waypoint.

  • Page 33: Tracback Navigation

    TracBack Navigation The third method of navigating to a destination is by using the GPS 125 Sounder’ s TracBack feature. The TracBack function allows you to quickly and easily retrace your path using the track log automatically stored in the receiver’ s memory. The advantage of the TracBack feature is to eliminate the need to mark way- points along the way and manually create and activate a route back to where you began your trip.
  • Page 34 REFERENCE TracBack Navigation The TracBack feature will navigate your track log back to the oldest point in the receiver’s memory. The track log will be divided into segments with tempo- rary waypoints to create a route back to the beginning of the track log.
  • Page 35 Creating and Navigating Routes The last form of navigating to a destination with the GPS 125 Sounder is by creating a user-defined route. The route navigation feature lets you plan and navigate a course from one place to another using a set of pre-defined waypoints.

  • Page 36: Route Definition Page

    REFERENCE Route Definition Page If you’re heading out with- out a planned route, the mark function can be used to quickly create a route back to your starting point. Create a series of waypoints along the way with the MARK key and save them to an open route from the mark position page.

  • Page 37: Clearing Routes

    To create a route from the route definition page: 1. Highlight the route number field and press 2. Enter a route number and press the firm. 3. Press to begin entry of a route comment. (Note that the default [first and last waypoint] comment will only appear if the comment field is blank.) 4.
  • Page 38 REFERENCE Clearing, Activating, and Inverting Routes Clearing a route only removes the waypoints from the route selected. The way- points used for the route will still remain in memory individually. To activate a route, high- light the ‘ACT?’ prompt and press ENTER.

  • Page 39: Active Route

    Active Route Page Once a route has been activated, the active route page will appear, displaying the waypoint sequence of your route with the estimated time enroute (ETE) at your present speed and distance to each waypoint. As long as you are navigating an active route, the active route page will become part of the primary page sequence of the unit.

  • Page 40: Editing Routes

    REFERENCE Editing Routes& On-Route GOTO’s Use the on-screen menu to select the desired editing function. You can skip ahead and navigate to any route way- point by highlighting the desired waypoint and press- ing the GOTO key. Editing Routes (continued) An on-screen menu of editing choices will appear, with options for reviewing, inserting, deleting, or changing the waypoint field highlighted.

  • Page 41: Sounder Page

    Sounder Page Digital Depth Overview & Sonar Target Range Modes Arches Black Line GARMIN’s exclusive See- Thru technology will allow you to distinguish sonar tar- gets from bottom clutter and thermoclines. The GPS 125 Sounder uses Depth Controlled Gain (DCG) to give you the max-...

  • Page 42: Underwater Waypoint Feature

    REFERENCE Range Modes & Underwater Waypoints Use the target cursor to mark the desired underwa- ter location. Note: The bearing and range shown are to the cur- sor’s location from your pre- sent position. The underwater waypoint will be marked using the sounder position.

  • Page 43: Zoom Function

    Zoom Function The sounder zoom function allows you to see the current display picture at 2 times (2X) or 4 times (4X) magnification. 2X means that the screen displayed will now cover 1/2 the range you were originally viewing in twice the detail, and 4X shows 1/4 the original range at four times the detail.

  • Page 44: Zoom Window

    REFERENCE Zoom Window If you activate the zoom while in Auto range mode and then decide to manual- ly adjust the range, a mes- sage window will appear. Highlight ‘Yes’ and press ENTER to activate Manual range mode and continue manually adjusting the range.
  • Page 45 Map Page The GPS 125 Sounder features a real-time moving map that can do much more than just plot your course and route. The Map Page also provides you with a tar- get cursor that will let you pan ahead to nearby way- points, determine the distance and bearing to any map position, and mark new waypoints while you navigate.

  • Page 46: Map Zooming

    REFERENCE Map Zooming, Panning, & Pointing To change the map scale, press the IN or OUT key once for each level desired. An on-screen window will display the current zoom scale. The crosshair will “snap” to waypoints highlighted on the map, which allows you to quickly review or go to the selected waypoint right from the Map Page.
  • Page 47 To go to a waypoint highlighted on the map: 1. Press the key. The GOTO waypoint page will appear with the waypoint’s name highlighted. 2. Press the key to confirm. To stop the panning function and display your present position: 1.
  • Page 48 REFERENCE Highway & Compass Pages To switch the navigation page to the Compass Page, press ENTER twice. To switch the navigation page to the Highway Page, press ENTER twice. Selecting a User-Defined Navigation Page Once you’ve selected a GOTO destination or acti- vated a MOB or route, the GPS 125 Sounder will pro- vide graphic steering guidance to the destination with one of two navigation pages:...
  • Page 49 Using the Highway Page The GPS 125 Sounder’ s Highway Page also pro- vides graphic steering guidance to a destination, with a greater emphasis on the straight-line desired course and the distance and direction you are off course. The bearing and distance to a waypoint--along with your current track and speed--are displayed at the top of the screen, with your digital depth, estimated time enroute (ETE), and velocity made good (VMG, or the rate you...
  • Page 50 REFERENCE Compass Page In this example, the Compass Page indicates that you are traveling in an east (090 degrees) direction and the destination way- point is southeast (108 degrees) of your current direction of travel. In this example, the Compass Page indicates that you are traveling in a southeast (139 degrees) and the destination waypoint is...

  • Page 51: Menu Page And Distance/Sun Calculation

    Menu Page The GPS 125 Sounder Menu Page provides access to submenu pages used to select and customize opera- tion and navigation setup. The 11 submenus are divid- ed into categories by function. See pg. 21-36 for dis- cussion of waypoint and route management submenus. We’ll now address the rest of the submenus in the order they appear on the Menu Page.

  • Page 52: Track Log Setup

    REFERENCE Track Log Setup & TracBack Turning the track recording option off will prevent you from using the TracBack option. Entering a time interval in to the track recording crite- ria will plot your position points further apart than they would be in the ‘Automatic’...

  • Page 53: Interface Setup

    The GRMN/GRMN setting is a proprietary format that lets you exchange information such as waypoints, routes and track logs between two GARMIN GPS devices or a PC. During data transfer, the number of packets being exchanged will be displayed on screen.

  • Page 54: Dgps Interface

    The baud rate is selectable from the GPS 125 Sounder. The RTCM/NMEA selection controls the GARMIN GBR-21 differential beacon receiver. Once a RTCM set- ting has been selected, the GPS 125 Sounder will either...

  • Page 55: System Setup

    The GPS 125 Sounder will also display one of three alert messages concerning DGPS operation through the message page: No DGPS Position— not enough data is available to compute a DGPS position. No RTCM Input— the beacon receiver is not properly connected or the baud rates do not match.

  • Page 56: Setting Time

    REFERENCE Setting Time, Screen Contrast, & Tone To display the correct local time, you must enter the appropriate offset from the chart at the end of Appendix C. Screen contrast may be adjusted with the contrast bar. Date and Time Setup The date and time field is located directly below the mode field.

  • Page 57: Navigation Setup

    Navigation Setup The navigation setup page is used to select units of measurement for position format, map datum, CDI scale, and distance, speed, and heading information. Position Formats The default position setting for the GPS 125 Sounder is latitude and longitude in degrees and min- utes (hdddºmm.mmm’).

  • Page 58: Units Of Measure

    REFERENCE Navigation & Speed Filter Choose a navigation unit you are familiar with or that may be appropriate to the situation in which the GPS 125 Sounder is used. The number entered repre- sents a window of time the GPS 125 Sounder considers in adjusting to changes in speed and track.

  • Page 59: Map Setup And Orientation

    Magnetic Heading Reference The GPS 125 Sounder’ s heading information can be displayed referencing magnetic north (auto or user- defined), true north, or calculated grid headings. The default setting is automatic magnetic north, which is suitable for most applications. To select a heading reference: 1.

  • Page 60: Map Setup

    REFERENCE Map Setup On-screen range rings will appear on the map when the ‘RINGS’ option is set to the ‘Yes’ position. A higher track log value will make a more detailed track log but will take up more memory. Selecting Displayed Items on the Map Page The rest of the map setup page lets you specify what items are displayed or plotted on the Map Page.

  • Page 61: Alarms Setup

    Alarms Setup The GPS 125 Sounder’ s alarms setup page is used to set the three available alarms: the anchor drag alarm, arrival alarm, and CDI alarm. The anchor drag alarm will sound if your boat has moved outside a range measured from a central point (your position).

  • Page 62: Sounder Setup

    REFERENCE Sounder Setup Adjust the sensitivity range between 0 and 100. The default setting is 50. The chart speed may be adjusted between 10 (slow- est) and 100. The default is 100. Sounder Setup The sounder setup page lets you customize the sounder to your needs and activate certain alarms.

  • Page 63: Fish Id

    Whiteline You may select how the area of strongest sonar return is shown through the whiteline setting. A high setting will cause a thick whiteline while low settings show a thin whiteline. To adjust the whiteline: 1. Highlight ‘WHITELINE?’ and press Page will appear with ‘WTLN’...

  • Page 64: Noise Rejection

    REFERENCE Noise Rejection & Depth Units Use the noise rejection fea- ture to minimize interfer- ence from nearby electronics. Choose a desired unit of measurement from feet, meters, or fathoms. ID Setting - FISH The above examples illustrate the difference between having Fish ID set to “FISH”...

  • Page 65: Keel Offset

    Keel Offset This setting allows you to set the point from which the GPS 125 Sounder will measure depth. This makes it possible to measure depth from the bottom of the keel instead of from the transducer’ s location. A posi- tive number will measure depth from a deeper point while a negative number reflects a shallower point.

  • Page 66: Navigation Simulator

    REFERENCE Nav Simulator Navigation Simulator The GPS 125 Sounder’ s simulator mode lets you practice all aspects of operation without actually track- ing satellites. You can also plan and practice trips, enter new waypoints and routes, and save them for use dur- ing normal operation.
  • Page 67 Once the simulator mode has been activated, use the Position, Compass, or Highway Page to set your speed, track and simulated depth. To enter track, speed, position, and depth: 1. Highlight the ‘TRACK’ field and press the 2. Enter a track and press 3.

  • Page 68: Appendix A--Installation

    APPENDIX A Installation Installation The GPS 125 Sounder must be properly installed according to the following instructions to get the best possible performance. To begin installation, you’ll need to select a suitable mounting position for the antenna, unit and transducer (see right).
  • Page 69 Two types of antenna assemblies are used with the GPS 125 Sounder: • White, GA28 Marine Antenna with 30 ft. cable and BNC connector • Black, GA26 Low-Profile Antenna with 8 ft. cable, BNC connector, flange, and Velcro™ mounting hardware. Mounting the White, GA28 Antenna To install the GA28 antenna: 1.
  • Page 70 APPENDIX A Installation Mounting the GPS 125 Sounder Two types of mounting options are included with the GA26: • Flange Mount Bracket • Dual-Lock Velcro Strips The flange mount bracket is useful for permanent antenna mounting on a flat surface. The dual-lock Velcro should be considered perma- nent even though it does not require drilling.

  • Page 71: Mounting The Gps 125 Sounder

    Mounting the GPS 125 Sounder The GARMIN GPS 125 Sounder’ s compact 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, overhead, or flush mounting.
  • Page 72 APPENDIX A Installation WARNING If your power source ever exceeds 18 volts, the above warning page will appear. The GPS 125 Sounder will automatically discontinue standard operation to avoid system overload and will allow only screen backlighting operation. Should this warning appear, you should check your power source and...
  • Page 73 To flush mount the GPS 125 Sounder: The GPS 125 Sounder can be mounted flush with a flat panel of .08-.52” thickness using the cam lobe fea- ture on its mounting bracket. 1. Cut a 4.15” W x 4.67” H hole in panel. 2.

  • Page 74: Connecting The Power/Data Cable

    APPENDIX B Wiring & Specifications To connect the GPS 125 Sounder to a power source: 1. Connect the RED harness lead to the positive side of a 12-18 volt DC power source. Make sure the power lead has an in-line 1-amp fuse installed. 2.
  • Page 75 Should your unit ever need repair, please take it to an authorized GARMIN service center. The GPS 125 Sounder has no user-serviceable parts. Never attempt any repairs yourself. To protect your GPS, never allow gasoline or other sol- vents to come in contact with the case or screen.
  • Page 76 Try the unit again later, possibly in a different location. Read Only Mem has Failed—The permanent memory has failed and the unit is not operable. Take your unit to an authorized GARMIN dealer for repairs. Received an Invalid WPT—A waypoint was received during upload transfer that has an invalid identifier.

  • Page 77: Time Offsets

    RTCM Input has Failed—DGPS data being received has been lost. You are no longer receiving the beacon signal. Searching the Sky—The GPS 125 Sounder is in searching the sky for almanac data or the unit is in AutoLocate mode. Shallow Water Alarm—The depth is equal to or less than the set alarm depth Sonar ASIC has Failed—The unit’...

  • Page 78: Appendix D-Map Datums

    APPENDIX D Map Datums Adindan Adindan- Ethiopia, Mali, Senegal, Sudan Afgooye Afgooye- Somalia AIN EL ABD ‘70 AIN EL ANBD 1970- Bahrain Island, Saudi Arabia Anna 1 Ast ‘65 Anna 1 Astro ‘65- Cocos Isl. ARC 1950 ARC 1950- Botswana, Lesotho, Malawi, Swaziland, Zaire, Zambia, Zimbabwe ARC 1960...
  • Page 79 European 1979 European 1979- Austria, Finland, Netherlands, Norway, Spain, Sweden, Switzerland Finland Hayfrd Finland Hayford- Finland Gandajika Base Gandajika Base- Republic of Maldives Geod Datm ‘49 Geodetic Datum ‘49- New Zealand Guam 1963 Guam 1963- Guam Island Gux 1 Astro Gux 1 Astro- Guadalcanal Island Hjorsey 1955...
  • Page 80 APPENDIX D Map Datums Nhrwn Masirah Nahrwn- Masirah Island (Oman) Nhrwn Saudi A Nahrwn- Saudi Arabia Nhrwn United A Nahrwn- United Arab Emirates Naparima BWI Naparima BWI- Trinidad and Tobago Obsrvtorio ‘66 Observatorio 1966- Corvo and Flores Islands (Azores) Old Egyptian Old Egyptian- Egypt Old Hawaiian Old Hawaiian- Mean...
  • Page 81 Almanac Data ..... .2 Alarms Setup .....57 Backlighting .
  • Page 82 APPENDIX E Index Receiver Status ....19 Routes ..... . .31-36 Active From Waypoint .

  • Page 83: Limited Warranty

    GARMIN Corporation warrants this product to be free from defects in materials and workmanship for one year from the date of purchase. GARMIN will at its sole option, repair or replace any com- ponents which fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or labor.
  • Page 84 © 1997 GARMIN Corporation 1200 E. 151st Street, Olathe, KS USA 66062 GARMIN (Europe) LTD - Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, UK SO51 9AQ Part Number 190-00111-00 Rev. B Printed in Taiwan...

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