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Marking a Position
The GPS 12XL allows you to mark and store up to
500 position 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
M
. 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
E
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.
1. After you have pressed the
M
key, highlight the
‘AVERAGE?’ field and press
E
. The Figure of
Merit (FOM) field will display the value reflecting esti-
mated accuracy of the averaged position. Note: As
the GPS 12XL calculates the FOM, it will rapidly
change before it stabilizes on one number.
2. The unit will continue averaging until you have high-
lighted ‘SAVE?’ and pressed
E
.
To enter a different waypoint name:
1. Highlight the waypoint name field, and press
E
.
2. Make the appropriate changes, and press
E
.
3. Highlight ‘SAVE?’, and press
E
.
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
E
.
2. Enter a route number, press
E
to confirm the
route number, and
E
again to save the waypoint.
17
After initiating the posi-
tion averaging function, a
Figure of Merit value will
be displayed, and the
‘SAVE?’ 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 desired
route number, highlight
‘SAVE?’ and press
ENTER.
GPS 12XL Manual Rev C 7/10/98 11:19 AM Page 17