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This also affects the navigational displays.
The easiest way to see the effects of S/A is to stand
still with the GPS receiver turned on and watch your
plot trail with position pinning turned off. You’ll see the
present position change, speed increase and decrease,
and a random plot trail on the plotter’s screen.
If you wish to turn the position pinning feature off, press
the MENU key, then highlight the “GPS Setup” label
and press the right arrow key. Now highlight the “Pin-
ning” label. Finally, press the left arrow key.
ALARMS
The GlobalNav 12 has several alarms. You can set an arrival alarm to
flash a warning message when you cross a preset distance from a way-
point. For example, if you have the arrival alarm set to .1 mile, then the
alarm will flash a message when you come within .1 mile of the recalled
waypoint. The course deviation indicator alarm (CDI) can warns when
your track drifts too far to the right or left of the course line to the waypoint.
For example, if the alarm is set to .1 mile, then the alarm flashes a mes-
sage if you drift .1 of a mile or more to the right or left of the line to the
waypoint. The anchor alarm is triggered when you drift outside of a preset
radius. Again, using the .1 mile as an example, if you’re anchored and
your boat moves more than .1 of a mile, the alarm will flash a message.
To use any of these alarms, first press the MENU key,
then select the “ALARMS/CDI” menu. A screen similar
to the one shown at right appears. Press the up or down
arrow key to move the black box to the desired alarm,
then press the right arrow key to turn it on.
To adjust an alarm’s distance, move the black box to
the alarm’s “DIST” menu item, then press the right or
left arrow keys to change the alarm’s distance.
When you’re finished, press the EXIT key to erase this menu.
Important Alarm Notes:
Anchor Alarm - Since civilian users don’t receive the accuracy given to
military users, the anchor alarm may be triggered even when you’re sit-
ting still. This typically happens when using small (less than .05 mile)
anchor alarm ranges. If you have a DGPS beacon receiver connected to
the GlobalNav 12, smaller ranges may be usable.