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Main Menu Pages
Map Datums
A map datum is a reference model of the earth’s shape. Every map uses a map datum
which is usually listed in the title block of the map. The default datum in the Foretrex 101
is WGS 84 (World Geodetic Survey, 1984). You should only change the datum if you are
using maps or charts that specify a different datum. Choose the ‘USER’ datum if using a
map with custom-designed grids.
NOTE: The ‘USER’ datum is based on a WGS-84-Local datum and is an advanced
feature for unlisted or custom datums. To learn more, check your local library or
the Internet for educational materials on datums and coordinate systems.
To change the Map Datum:
1. Press the PAGE button until the Main Menu Page is displayed. Use the UP and DOWN
buttons to highlight ‘SETUP’ and press ENTER.
2. Use the
UP and DOWN buttons to highlight ‘SET UNITS’ and press ENTER.
3. Press the UP or DOWN button to highlight the ‘MAP DATUM’ field and press the
ENTER button.
4. Press the
UP or DOWN button to highlight the desired datum and press the ENTER
button.
5. Press the
PAGE button to return to the Main Menu Page.
Setup Menu: Set Units
Set Units Page
Selecting the Map Datum