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Units Page
The Units features are best used by individuals with
a working knowledge of map grids and datums. To learn
more about these subjects, visit the National Imagery and
Mapping Agency at http:// www.nima.mil or inquire at
your library.
Position Format - Allows you to choose from
different grid formats. The default position format,
‘hddd°mm.mmm’ displays the latitude and longitude in
degrees and minutes and is most commonly used.
Map Datum - Offers a selection of nearly all map
datums in common use. Every map is based on a map
datum (a reference model of the earth’s shape) and is
usually listed in the title block of the map. If you are
comparing GPS coordinates to a paper map, chart, or
other reference, the map datum in this fi eld must match
the horizontal map datum used to generate the map or
other reference. The default datum is WGS 84 (World
Geodetic Survey 1984) and should only be changed when
using maps or charts specifying a different datum. If a
map does specify a datum, use the options list to fi nd
datums applicable to the region of the map, selecting the
one that provides the best positioning at a known point.
If necessary, you also may choose the ‘User’ datum for
custom designed grids.
Distance/ Speed - You can choose from three units of
measure to display your rate of travel.
Elevation/ Vertical Speed - You can choose from
two units of measure to record your elevation and rate of
ascent.
To select Units Page options:
1. For all fi elds on this page, highlight the fi eld and
then press the CLICK STICK to display the Options
Menu for the fi eld.
2. Highlight the desired option on the menu and then
press the CLICK STICK to place it in the fi eld.
Setup Options
Main Menu
Units Page
Position Format
Options Menu
Map Datum Options
Menu
Distance/
Speed Options
Elevation/
Vertical
Speed
Options
190-00219-00_0C.indd 50 9/20/2002, 9:54:40 AM