38 GPSMAP 640 Owner’s Manual
Marine Mode: Advanced Conguration
NOTE: Additional AIS and DSC conguration options are
available from the Navigation chart options. See page 39.
From the Home screen, touch Congure > Navigation.
Auto Guidance—
select the Auto Guidance parameters for your
boat.
Safe Depth—set the minimum depth (using chart depth data)
allowed when calculating an auto-guidance path. A safe depth of
less than one meter is not allowed when using Auto Guidance.
Safe Height—set the minimum height (using chart height data)
of a bridge that your boat can safely travel under.
Shoreline Distance—set how close you want to travel near the
shore: Nearest, Near, Normal, Far, or Farthest. This is used
by the automatic guidance calculation to determine how close
to the shoreline you want the automatic-guidance line to be.
Changing this while navigating an automatic-guidance line will
recalculate the path.
Route Labels—for saved routes, this determines whether route
turns are indicated by number (Turn 1, Turn 2, and so on), by
waypoint name, or whether the description of turns is hidden.
Turn Transition Activation
—set how the chartplotter transitions
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to the next leg in a route. Increasing time or distance can improve
autopilot accuracy when navigating a route or an automatic-
guidance line with many frequent turns, or when traveling at higher
speeds. Decreasing time or distance can improve autopilot accuracy
when navigating a straighter route or automatic-guidance line, or
when traveling at slower speeds.
Turn Transition Time—set the time before a turn in a route
that you transition to the next leg.
Turn Transition Distance—set the distance before a turn in a
route that you transition to the next leg.
Off—transition when you have arrived at the next leg.
XM Radio
From the Home screen, touch Congure > XM Audio.
NOTE:
You must connect the optional GXM 40 XM receiver and
have a subscription to XM Radio to use XM Radio features. For
more information, refer to page 47.
Volume Slider—adjust the XM volume level.
Volume—show the volume level as a percentage. Touch Volume to
mute the XM Radio.
Channel Guide—select the specic XM channel within the
currently selected category.
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