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After you’ve entered the latitude/longitude correction, press the ENT key
to accept it. The GlobalNav 310 erases the PCF entry screen and returns
to the navigation or mapping screens with the correction factor applied.
POSITION PINING
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 availability. 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 310 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 pre-
vents 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
310 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.
To turn the position pining feature off, press the MENU key, then highlight
the “GPS Setup” label and press the right arrow key. Now highlight the
“Pos Pinning” label. Finally, press the left arrow key.
ALARMS
This unit has several alarms. You can set an arrival alarm to sound a
warning tone when you cross a preset distance from a waypoint. For
example, if you have the arrival alarm set to .1 mile, then the alarm will
sound when you come within .1 mile of the recalled waypoint. The course
deviation indicator alarm (CDI) can sound a warning 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 will sound if you drift .1 of a mile
or more to the right or left of the line to
the waypoint. The anchor alarm sounds
a warning 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 sound.
To use any of these alarms, first press