Garmin GPSMAP 640 Owner's Manual page 50

Marine Mode: Advanced Configuration
• Shoreline Distance—set how close you want to travel near the
shore: Nearest, Near, Normal, Far, or Farthest. The Shoreline
Distance setting indicates how close to the shore you want the
Auto Guidance line to be placed. The Auto Guidance line may
move if you change this setting while navigating.
Setting the Distance from Shore
The available values for the Shoreline Distance setting (Nearest,
Near, Normal, Far, or Farthest) are relative, not absolute. To place
the Auto Guidance line the appropriate distance from shore, you
can assess the placement of the Auto Guidance line using one or
more familiar destinations that require navigation through a narrow
waterway.
1. Dock your boat or drop anchor.
2. From the Home screen, select
Guidance > Shoreline Distance
3. From the Home screen, select
4. Select a destination that you have navigated to previously.
5. Select Navigate To > Guide
6. Review the placement of the Auto Guidance line. Determine
whether the line safely avoids known obstacles, and whether
the turns enable efficient travel.
7. Complete an action:
44
Configure > Navigation > Auto
> Normal.
Charts > Navigation Chart.
To.
• If the placement of the Auto Guidance line is satisfactory,
select Menu > Stop Navigation. Proceed to step 11.
• If the Auto Guidance line is too close to known obstacles,
from the Home screen, select
Auto Guidance > Shoreline Distance
• If the turns in the Auto Guidance line are too wide, from
the Home screen, select
Guidance > Shoreline Distance
8. If you selected Near or Far
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 3
requires navigation through a narrow waterway.
9. Complete an action:
• If the placement of the Auto Guidance line is satisfactory,
select Menu > Stop Navigation. Proceed to step 11.
• If the Auto Guidance line is too close to known obstacles,
from the Home screen, select
Auto Guidance > Shoreline Distance
GPSMAP 620 and GPSMAP 640 Owner's Manual
Configure > Navigation
> Far.
Configure > Navigation > Auto
> Near.
in step 7, review the placement
Configure > Navigation
> Farthest.
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