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UNITS Page
Using the Geko 101 with a paper map increases the navigation power of each. To use a
map in conjunction with the Geko 101, you must select the position format, map datum,
map units, and north reference to match the map. The Geko 101 supports both the UTM/
UPS and latitude/longitude grids, which defi ne position location for the entire globe.
Position Format
The default position format (and the one most commonly used) for the Geko 101 is
latitude and longitude in degrees and minutes (hdddº mm.mmm’). Choose from 11 other
position formats or choose the ‘User’ position format to approximate custom-designed grids.
For more information on grids and datum we recommend you visit the National Imagery
and Mapping Agency at http://www.nima.mil.
To change the Position Format (grid):
1. From the UNITS Page press the UP or DOWN button to highlight the ‘POSITION FRMT’
fi eld and press the OK button.
2. Press the UP or DOWN button to highlight the desired format and press the OK button.
3. Press the PAGE button to return to the MENU page.
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 Geko 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.
Menu Page
Units Page
Data Entry Pages exist for
the User Grid Format and
the User Datum Setup.
Twelve position formats are
available in the Geko 101.
190-00297-00_0C.indd 16 10/1/2003, 12:59:14 PM