Appendix D: Map Datum And Location Formats; Map Datums; Location Formats - Garmin G3X Touch Pilot's Manual

APPENDIX D: MAP DATUM AND LOCATION
FORMATS

MAP DATUMS

A datum is a mathematical model of the Earth that approximates the shape of the
Earth 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 as
trig. stations) whose locations have been accurately measured and calculated on
this reference surface. Lines of latitude and longitude on a chart are referenced to a
specific map datum. Every chart has a map datum reference and the G3X Touch can
be set to match most of those commonly used.

LOCATION FORMATS

Your current location can be viewed on the GPS in the form of coordinates. Since
different charts use different location formats, Garmin GPS units allow you to choose
the correct coordinate system for the type of chart you are using. The most common
format is latitude and longitude, which is used by all Garmin units. You can change the
location format to use with other coordinate systems.
Map Datum and Location Format selection can be performed on the Position Setup
Page.
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 are
displayed. 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 Restore
Defaults Button to restore the default settings for all the position items.
190-01754-00 Rev. L Garmin G3X Touch Pilot's Guide
Appendix D
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