Marking a Position
The GPS 12XL allows you to mark and store up to
500 positions as waypoints. A waypoint can be entered
by taking an instant electronic fix, by manually enter-
ing coordinates (pg. 20), or by using the bearing and
distance to a known position (pg. 20).
To mark your present position:
1. Press
. The mark position page will appear,
showing the captured position and a default three-
digit name.
2. To save a default name and symbol, press
to
confirm the ‘SAVE?’ prompt.
Position Averaging Function
The GPS 12XL positioning averaging function will
help reduce the effects of selective availability upon
position error when marking a waypoint, providing
more accurate saved positions.
1. After you have pressed the
key, highlight the
‘AVERAGE?’ field and press
. The Figure of
Merit (FOM) field will display a value reflecting esti-
mated accuracy of the averaged position. Note: As
the GPS 12XL calculates the FOM, it will rapidly
change initially then begin to stabilize over time.
2. The unit will continue averaging until you have high-
lighted ‘SAVE?’ and pressed
.
To enter a different waypoint name:
1. Highlight the waypoint name field, and press
.
2. Make the appropriate changes, and press
.
3. Highlight ‘SAVE?’, and press
.
Note: To enter a different waypoint symbol or com-
ment, see pg. 21.
To add this waypoint to a route:
1. Highlight the ‘Add to route number’ field, and press
.
2. Enter a route number, press
to confirm the
route number, and
again to save the waypoint.
The waypoint will be added to the end of the selected
route—after any other waypoints already in the route.
17
After initiating the posi-
tion averaging function, a
Figure of Merit value will
be displayed, and the
‘ S AVE?’ field will auto-
matically be highlighted.
REFERENCE
Position
Averaging
The GPS 12XL will save
new waypoints with a
default three-digit name.
To add the waypoint to a
route, enter the desire d
route number, highlight
‘ S AVE?’
and
pre s s
ENTER.
GPS 12XL NEW Manual Rev A 2/6/98 3:18 PM Page 17
