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After you’ve entered the latitude/longitude correction, press the ENT key
to accept it. The GlobalNav 200 erases the PCF entry screen and returns
to the navigation or mapping screens with the correction factor applied.
POSITION PINNING
When using a GPS receiver at extremely low
speeds, it can have trouble determining your
course over ground, or direction you’re travelling.
This is due in large part to SA, or selective avail-
ability. SA is small inaccuracies purposefully put
into the GPS satellite’s signal by the government.
This cause wide variations in the track display and
other navigation displays when using the unit at
slow speeds.
If you’re using the GlobalNav 200 without DGPS
and stop, the position pinning feature locks the
present position indicator on the plotter until you’ve
moved a short distance or exceed a very slow
speed. This prevents the “wandering” plot trail seen when you’re stopped
with position pinning turned off. This also affects the navigational displays.
The easiest way to see the effects of S/A is to stand still with the GlobalNav
200 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 “Pinning” label. Finally, press the left arrow key.
ALARMS
The GlobalNav 200 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 line to the waypoint. For
example, if the alarm is set to .1 mile, then the alarm flashes a message
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