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Setup Page
Position Format
The default position format (and the one most commonly used) for the eTrex is latitude
and longitude in degrees and minutes (hdddº mm.mmm). You may also choose from 17
other position formats. There is also a “User” position format which allows you to approxi-
mate custom-designed grids. For more information on grids and datums we recommend you
visit the National Imagery and Mapping Agency at
http://www.nima.mil
.
To change the Position Format:
1. Press the PAGE button and switch to the MENU Page. Press the UP or DOWN button
and highlight ‘SETUP.’ Press ENTER. Press the UP/DOWN buttons to select ‘UNITS.’ Press
ENTER. The UNITS Page appears.
2. Press the
UP or DOWN button to select the ‘POSITION FRMT’ field. Press ENTER.
3. Press the
UP or DOWN button to select the desired format. Press ENTER. Press PAGE to
get back to the page of your choice.
Map Datums
A map datum is a reference model of the earth’s shape. Every map uses a map datum.
The map datum is usually listed in the title block of the map. If you are comparing GPS
coordinates to a paper map or other reference, the map datum in the eTrex should match the
horizontal map datum used to generate the chart or other reference.
The default datum in the eTrex 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 than
WGS 84. If no datum is specified, you can select each datum applicable to your region until
you find the datum that provides the best positioning at a known point. You may also choose
the “User” datum for use with custom-designed grids.
Data entry pages for the
User Grid Format and the
User Datum Setup allow you
to configure the eTrex for
compatibility with custom
designed grids. We recom-
mend surfing the net for links
to Garmin user-grid and user
datum information. There are
also excellent navigation and
GPS articles available on-line
which will enhance your
overall knowledge of GPS.
Eighteen position formats are available in the eTrex.
User
Datum
User Grid
Units Page