Garmin GPSMAP 640 - Manual (Page 51)

GPSMAP 620 and GPSMAP 640 Owner’s Manual 45
Marine Mode: Advanced Configuration
• If the turns in the Auto Guidance line are too wide, from
the Home screen, select Configure > Navigation > Auto
Guidance > Shoreline Distance > Nearest .
10. If you selected Farthest or Nearest in step 9, review the
placement of the Auto Guidance line. Determine whether the
line safely avoids known obstacles, and whether the turns
enable efficient travel.
Auto Guidance maintains a wide clearance from obstacles in
open water, even if you set the Shoreline Distance setting to
Near or Nearest . As a result, the chartplotter may not reposition
the Auto Guidance line, unless the destination selected in step 4
requires navigation through a narrow waterway.
11. Repeat steps 1–10 at least once more, using a different
destination each time, until you are familiar with the functionality
of the Shoreline Distance setting.
Configuring Route Turn Transitions
You can set how much time, or how far, before a turn in a route that
you transition to the next leg. Raising this value can help improve
the accuracy of the autopilot when navigating a route or an Auto
Guidance line with many frequent turns, or at higher speeds. For
straighter routes or slower speeds, lowering this value can improve
autopilot accuracy.
1. From the Home screen, select Configure > Navigation > Turn
Transition Activation .
2. Complete an action:
• Select Time > Turn Transition Time , and enter the time.
• Select Distance > Turn Transition Distance , and enter the
distance.
3. Select Done .
Configuring Navigation Chart Options
From the Navigation chart, touch Menu .
Waypoints and tracks—access shortcuts to waypoint and track
information. For more information on waypoints and tracks,
see page 21 .
• tracks—toggle tracks on or off.
• Waypoints List—view a list of all saved waypoints.
• New Waypoint—mark a new waypoint.
• Active tracks—change active track options, clear the active
track, follow the active track, or save the active track.
• Saved tracks—view the saved tracks list.
• tracks Display—show or hide tracks on the chart according to
color.