Datum - Eagle AccuMap Sport Installation And Operation Instructions Manual

you're stopped. This also prevents the unit from rotating the map in all
directions when it's in the "track-up" mode.
However, if you're using the AccuMap Sport when hiking, horseback riding,
or other typically slow-speed activities, turn the track holding feature off.
This allows the unit to show changes in your direction of travel that might
not appear while you're moving slowly.
To turn the track holding feature off, press the MENU key, then press the
up or down arrow keys until the "System Setup" menu appears, then press
the right arrow key on the "GPS Corrections" label. The screen shown on
the previous page appears. The track holding menu is at the top of this
screen. Press the left arrow key to turn the track holding feature off. Press
the EXIT key to erase this menu.

DATUM

Maps and charts are based on a survey of the area that's covered by the
map or chart. These sur veys are called "Datums". Maps that are created
using different datums will show the same latitude/longitude in slightly
different locations.
All datums are named. The GPS system is based on the WGS-84 datum,
which covers the entire world. Other datums may also cover the entire
world, or just a small portion. By default, the AccuMap Spor t shows your
position on the map using the WGS-84 datum. However, it can show your
position using one of 99 different datums.
To change the datum, move the black box on the
"GPS Corrections" menu to the "Select Datum"
label. Press the right arrow key. A screen similar to
the one at right appears.
The black box is resting on the WGS-84 label. To
change it, simply press the up or down arrow keys
until the black box is on the desired datum, then
press the ENT key. This selects the datum and
erases the select datum menu. The AccuMap Sport is now using the da-
tum you selected.
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