Garmin GPS 125 Sounder User Manual

GPS 125SounderMarineNavigatorZOOMOwner’s Manual&Reference125 Man Rev B 7/23/98 11:47 AM Page i

Initializing the ReceiverThe receiver is shipped from the factory inAutoLocate™ mode, which enables the GPS 125Sounder to determine its location anywh

2. Use theDkey to scroll through the list options untilthe country of your present position appears.3. Use Uto highlight the country/state/region you’

Sounder PagePrimary PagesThe GPS 125 Sounder uses six primary “pages” togive you information. The pages are arranged in a con-tinual loop and can be e

Map PageThe Map Page acts as a window that allows you toview your position, the “path” you have traveled over,and nearby waypoints. A diamond icon in

Getting Started TourNow that your GPS receiver has been initialized andyou are familiar with the primary pages, it’s time to takea tour. This is a liv

4. Press the Rkey once to move the character highlightto the next character space.5. Repeat steps 3 and 4 until the word ‘DOCK’ is shown.6. Press Fto

Using the Position and Map Pages (continued)Now let’s change the display to the Map Page andwatch the track log of our tour:1. Press Jto change from t

Using the Highway PageThe GPS 125 Sounder’s Highway Page providesgraphic steering guidance to a destination, with anemphasis on a straight-line course

Using the Highway Page (continued)While navigating, you may use the Compass Page(see picture below left) instead of the Highway Page. To select the Co

Using the Sounder Page (continued)The area of strongest sonar return (whiteline) isdisplayed as light and dark checkering. Typically, thebottom will b

Software Version 2.0 or above© 1997 GARMIN Corporation1200 E. 151st Street, Olathe, KS USA 66062Tel: 913-397-8200 or 800-800-1020Fax: 913-397-8282Web

The zoom function is accessed by using the IN andOUT key when viewing the Sounder Page.Once activated, the zoomed picture becomes theSounder Page disp

Moving the Zoom Window (continued)To save a zoom window range in Manual:1. Press the Rkeypad up to view a shallower range ordown to view a deeper rang

Satellite PageThe Satellite Page displays the status of variousreceiver functions. The status information will help youunderstand what the GPS 125 Sou

Receiver Status and EPEReceiver status is indicated at the top left of thescreen, with the current horizontal accuracy (estimatedposition error, in fe

Screen BacklightingThe GPS 125 Sounder features three levels of back-lighting. Activate the backlight by pressing the POWERkey briefly. Each press of

Marking and Saving WaypointsKnowing your present position is only part of anynavigation equation. You also need to keep track ofwhere you’ve been and

Waypoint SubmenusThe GPS 125 Sounder has three waypoint submenupages that let you manage a large number of waypointsquickly and efficiently. The neare

Waypoint List PageThe waypoint list page provides you with a com-plete list of all waypoints currently stored in the GPS125 Sounder. The total number

Waypoint Definition PageThe last of the three waypoint management pages isthe waypoint definition page. This page lets you createnew waypoints manuall

The GPS 125 Sounder’sadvanced waypoint andplanning features allow youto create new waypointsand practice navigationwithout ever leaving theslip.If you

iINTRODUCTIONOverviewGPS 125SOUNDEROperator’sManualWelcome to the easiest-to-use combination GPS/Depth Sounder on thewater! The GPS 125 Sounder repres

Editing Existing WaypointsThe waypoint definition page also allows you tochange the name, coordinates, comment or referencewaypoint field for a stored

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

Selecting a GOTO DestinationThe GPS 125 Sounder provides four ways to navi-gate to a destination: GOTO, MOB, TracBack and routenavigation. The most ba

TracBack NavigationThe third method of navigating to a destination isby using the GPS 125 Sounder’s TracBack feature. TheTracBack function allows you

Tips on Creating and Using the TracBack FeatureThe GPS 125 Sounder’s TracBack feature is designedto help you quickly create and activate a route that

Creating and Navigating RoutesThe last form of navigating to a destination withthe GPS 125 Sounder is by creating a user-definedroute. The route navig

Route Definition PageThe GPS 125 Sounder lets you create and store upto 20 routes of 30 waypoints each. Routes are created,copied, and edited through

To create a route from the route definition page:1. Highlight the route number field and press F.2. Enter a route number and press the Fkey to con-fir

Clearing Routes (continued)The clear route warning will appear, asking you toconfirm that you want to remove all waypoints from theroute.1. Highlight

Active Route PageOnce a route has been activated, the active routepage will appear, displaying the waypoint sequence ofyour route with the estimated t

CautionINTRODUCTIONiiThe GPS system is operated by the government of the United States,which is solely responsible for its accuracy and maintenance. T

Editing Routes (continued)An on-screen menu of editing choices will appear,with options for reviewing, inserting, deleting, orchanging the waypoint fi

Sounder PageThe Sounder Page lets you use the GPS 125 as afishfinder. The top of the screen shows the range modebeing used, the water temperature (if

To switch from auto to manual mode:1. Press the Uor Dkeys until the desired depthrange is displayed on the depth scale at the left side ofthe page.2.

Zoom FunctionThe sounder zoom function allows you to see thecurrent display picture at 2 times (2X) or 4 times (4X)magnification. 2X means that the sc

To save a zoom window range in Auto:1. Press the Rkeypad up to view a shallower range ordown to view a deeper range. The range scale on theleft side o

Map PageThe GPS 125 Sounder features a real-time movingmap that can do much more than just plot your courseand route. The Map Page also provides you w

Zooming, Panning, and PointingThere are three main functions you can performfrom the Map Page: zooming, panning, and pointing.Zooming is increasing or

To go to a waypoint highlighted on the map:1. Press the Gkey. The GOTO waypoint page willappear with the waypoint’s name highlighted.2. Press the Fkey

Selecting a User-Defined Navigation PageOnce you’ve selected a GOTO destination or acti-vated a MOB or route, the GPS 125 Sounder will pro-vide graphi

Using the Highway PageThe GPS 125 Sounder’s Highway Page also pro-vides graphic steering guidance to a destination, with agreater emphasis on the stra

1INTRODUCTIONTable ofContentsSECTION ONE IntroductionGlossary/Navigation Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4S

Using the Compass PageThe GPS 125 Sounder’s Compass Page providesgraphic steering guidance to a destination waypoint.The bearing (BRG) and distance (D

Menu PageThe GPS 125 Sounder Menu Page provides accessto submenu pages used to select and customize opera-tion and navigation setup. The 11 submenus a

Track CriteriaThe stored track criteria determines how often posi-tions are stored in the track log. The default setting isautomatic, which stores tra

Interface SetupThe interface setup page lets you specify the inter-facing formats for connecting external devices. Thereare five interface options: GR

DGPS InterfaceThe last two format settings allow the differential-ready GPS 125 Sounder to accept RTCM DGPS correc-tions in RTCM 104 version 2.0 forma

The GPS 125 Sounder will also display one of threealert messages concerning DGPS operation through themessage page:No DGPS Position— not enough data i

Date and Time SetupThe date and time field is located directly below themode field. Because the time shown is UTC time, youwill need to enter a time o

Navigation SetupThe navigation setup page is used to select units ofmeasurement for position format, map datum, CDIscale, and distance, speed, and hea

Units of MeasureThe GPS 125 Sounder lets you select nautical(default), statute, or metric units of measure for allspeed and distance fields.To change

Magnetic Heading ReferenceThe GPS 125 Sounder’s heading information can bedisplayed referencing magnetic north (auto or user-defined), true north, or

GlossaryINTRODUCTION2The GPS 125 Sounder is a powerful navigation tool that can guide you any-where in the world. To better understand its operation a

Selecting Displayed Items on the Map PageThe rest of the map setup page lets you specify whatitems are displayed or plotted on the Map Page. Thefirst

Alarms SetupThe GPS 125 Sounder’s alarms setup page is usedto set the three available alarms: the anchor drag alarm,arrival alarm, and CDI alarm.The a

Sounder SetupThe sounder setup page lets you customize thesounder to your needs and activate certain alarms.Access the Sounder Setup from the Menu Pag

59WhitelineYou may select how the area of strongest sonarreturn is shown through the whiteline setting. A highsetting will cause a thick whiteline whi

60The above examples illustrate the differencebetween having Fish ID set to “FISH” versus “ON”. Themost information is available with the “ON” setting

Keel OffsetThis setting allows you to set the point from whichthe GPS 125 Sounder will measure depth. This makesit possible to measure depth from the

Nav SimulatorREFERENCE62Navigation SimulatorThe GPS 125 Sounder’s simulator mode lets youpractice all aspects of operation without actually track-ing

63REFERENCENav SimulatorOnce the simulator mode has been activated, usethe Position, Compass, or Highway Page to set yourspeed, track and simulated de

64InstallationThe GPS 125 Sounder must be properly installedaccording to the following instructions to get the bestpossible performance.To begin insta

Two types of antenna assemblies are used with theGPS 125 Sounder:• White, GA28 Marine Antenna with 30 ft. cableand BNC connector• Black, GA26 Low-Prof

3INTRODUCTIONGlossaryLatitude The north/south measurement of position perpendicular to the earth’s polar axis.LongitudeAn east/west measurement of pos

Mounting the GPS 125 SounderTwo types of mounting options are included withthe GA26:• Flange Mount Bracket• Dual-Lock Velcro StripsThe flange mount br

Mounting the GA 26 Antenna (cont.)2. Using the mounting bracket as a template, mark and thendrill four 0.115-.125” holes.3. If necessary, apply silico

Mounting the GPS 125 Sounder (cont.)• There should be at least 2.00” (5.0 cm) clearancebehind the case to allow connection of the anten-na, power/data

To flush mount the GPS 125 Sounder:The GPS 125 Sounder can be mounted flush with aflat panel of .08-.52” thickness using the cam lobe fea-ture on its

Wiring &SpecificationsAPPENDIX B70Connecting the power/data cableThe power/data cable connects the GPS 125 Soundersystem to a 12-18 volt DC power

71APPENDIX BWiring &SpecificationsPHYSICALCase: gasketed-constructionSize: 4.9”H x 5.3”W x 2.4”D(15.6 x 5.1 x 1.23 cm)Weight: Less than 1 lb. (454

Messages &Time OffsetsAPPENDIX C72Active WPT Can’t be Deleted—You have attempted to change the “active to”’ or “active from”waypoint. Clear the ac

Longitudinal Zone Offset Longitudinal Zone OffsetW180.0º to W172.5º -12 E007.5º to E022.5º 1W172.5º to W157.5º -11 E022.5º to E037.5º 2W157.5º to W142

Map DatumsAPPENDIX D74The following list shows the 104 map datumsavailable for the GPS 125 Sounder. Abbreviationsare listed first, followed by the cor

75APPENDIX DMap DatumsEuropean 1979 European 1979- Austria,Finland, Netherlands,Norway, Spain, Sweden,SwitzerlandFinland Hayfrd Finland Hayford- Finla

NavigationBasicsINTRODUCTION4NORTH“ACTIVE FROM”WAYPOINTNORTHDTKCROSSTRACK ERRORBRGTRKGROUND SPEEDDISTANCE“ACTIVE TO”WAYPOINT“ACTIVE LEG”The GPS 125 So

Map DatumsAPPENDIX D76Nhrwn Masirah Nahrwn- Masirah Island(Oman)Nhrwn Saudi A Nahrwn- Saudi ArabiaNhrwn United A Nahrwn- United ArabEmiratesNaparima B

APPENDIX E77IndexAAlmanac Data . . . . . . . . . . . . . . . . . . . . . .2Alarms Setup . . . . . . . . . . . . . . . . . . . . .57BBacklighting . .

IndexAPPENDIX E78RReceiver Status . . . . . . . . . . . . . . . . . . . .19Routes . . . . . . . . . . . . . . . . . . . . . . .31-36Active From Wayp

LIMITED WARRANTYGARMIN Corporation warrants this product to be free fromdefects in materials and workmanship for one year from the date ofpurchase. GA

© 1997 GARMIN Corporation1200 E. 151st Street, Olathe, KS USA 66062GARMIN (Europe) LTD - Unit 5, The Quadrangle,Abbey Park Industrial Estate, Romsey,

Getting Started with Your GPSWelcome to the exciting world of GARMIN GPS!The GPS 125 Sounder represents GARMIN’s continuingcommitment to provide marin