System Setup; Gps Corrections; Track Holding - Eagle AccuMap Sport Installation And Operation Instructions Manual

SYSTEM SETUP

The AccuMap Sport has several menus and
commands listed under the "System Setup" la-
bel on the main menu. To use these, press the
MENU key, then press the up or down arrow
keys until the black box is ont he "System
Setup" label. Press the right arrow key. The
screen shown at right appears.

GPS CORRECTIONS

The AccuMap Sport has several features on this
menu that let you customize its mapping and posi-
tion functions.

TRACK HOLDING

Your AccuMap Sport has a special feature called
"Track Holding" that prevents the unit from show-
ing random numbers on the navigation screens when you're travelling
less than 3 miles per hour. These random numbers are mostly caused by
S/A (Selective Availability). S/A is random errors introduced into the GPS
satellite network by the government to degrade the system's accuracy to
the general public. The error can be as bad as 100 meters and 5 m.p.h.,
which is within the government's GPS specifications. You can see this
happening when you're standing still with the track holding feature turned
off. With it turned off, your present position will move on the map even
though you're standing still.
The track holding feature works by locking the track at the last known
direction when you slow below three miles per hour. Above three miles
per hour, the track holding feature is disabled. This feature is automati-
cally activated when the unit is turned on for the first time or after you
preset it.
You'll see the unit's track "lockup" when you slow below 3 miles per hour.
If you have the unit in the "track-up" mode, the map will also lock in the
last known track direction. When you resume speed, all features operate
normally.
When you're stopped at a traffic light, the track holding feature is useful to
prevent the annoying random numbers from appearing on the display while
46