Garmin G3X Touch Pilot’s Guide190-01754-00 Rev. LAppendix D395SystemOverviewFlightInstruments EISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeatures AFCS Annun/Alerts Appendix IndexAPPENDIX D: MAP DATUM AND LOCATIONFORMATSMAP DATUMSA datum is a mathematical model of the Earth that approximates the shape of theEarth and enables calculations to be carried out in a consistent and accurate manner.The datum is physically represented by a framework of ground monuments (such astrig. stations) whose locations have been accurately measured and calculated onthis reference surface. Lines of latitude and longitude on a chart are referenced to aspecific map datum. Every chart has a map datum reference and the G3X Touch canbe set to match most of those commonly used.LOCATION FORMATSYour current location can be viewed on the GPS in the form of coordinates. Sincedifferent charts use different location formats, Garmin GPS units allow you to choosethe correct coordinate system for the type of chart you are using. The most commonformat is latitude and longitude, which is used by all Garmin units. You can change thelocation format to use with other coordinate systems.Map Datum and Location Format selection can be performed on the Position SetupPage.Changing position settings:1) Press the MENU Key twice to display the Main Menu.2) Touch the Setup Button. The Setup Page is displayed.3) Touch the Position Button. The Position Setup Page is displayed.4) Touch the Location Format button. The Location Format choices aredisplayed. Touch the button with the desired format.5) Touch the Map Datum button. The Map Datum choices are displayed.Touch the button with the desired format.6) Press the MENU Key to display the Position Menu. Touch the RestoreDefaults Button to restore the default settings for all the position items.
