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Marking a Position
The GPS 12 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
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 12 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
M
key, highlight the
‘AVERAGE?’ field and press
E
. The Figure of
Merit (+/-) field will display a value reflecting estimat-
ed accuracy of the averaged position. Note: As the
GPS 12 calculates the FOM, it will rapidly change ini-
tially then begin to stabilize over time.
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.
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 12 will save new
waypoints with a default
three-digit name. To add
the waypoint to a route,
enter the desired ro u t e
number, highlight ‘SAVE?’
and press ENTER.
GPS12B 1/13/99 4:27 PM Page 17