Auto Guidance Line Configurations - Garmin GPSMAP 4008 Owner's Manual

Auto Guidance Line Configurations

You can set the data the chartplotter uses when calculating an Auto Guidance line.
Note: Auto Guidance is available with a preprogrammed BlueChart g2 Vision data card.
Safe Water Depth and Safe Obstacle Height
The Safe Depth and Safe Height settings influence how the chartplotter calculates an Auto Guidance line. If
an area has an unknown water depth or an unknown obstacle height, the Auto Guidance line is not calculated
in that area. If an area at the beginning or the end of an Auto Guidance line is shallower than the safe water
depth or lower than the safe obstacle height, the Auto Guidance line is not calculated in that area. On the chart,
the course through those areas appears as a gray line. When your boat enters one of those areas, a warning
message appears.
Setting the Safe Water Depth and the Safe Obstacle Height
1. From the Home screen, select Configure > Preferences > Navigation > Auto Guidance.
2. Select Safe Depth to set the minimum depth (chart depth datum) the chartplotter uses when calculating an
Auto Guidance line.
3. Enter the minimum safe depth.
4. Select Done.
5. Select Safe Height to set the minimum height (chart height datum) of a bridge that your boat can safely
travel under.
6. Enter the minimum safe height.
7. Select Done.
Shoreline Distance Auto Guidance Setting
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 ensure that the Auto Guidance line is placed an 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 Configure > Preferences > Navigation > Auto Guidance > Shoreline
Distance > Normal.
3. From the Home screen, select Charts > Navigation Chart.
4. Use the cursor to select a destination to which you have navigated previously.
5. Select Navigate to > Guide to.
6. Review the placement of the Auto Guidance line. Determine whether the line safely avoids known
obstacles, and whether the turns enable efficient travel.
GPSMAP 4000/5000 Series Owner's Manual
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CAUTION
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Device Configuration
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