Garmin GPSMAP 640 Owner's Manual page 38

Marine Mode: Managing Information From Other Vessels
When course over ground and heading information are provided by
an activated AIS target but rate of turn information is not provided,
the projected course of the target is calculated based on the course
over ground information.
Activated
AIS target
Target with Projected Course and Heading
Turning Off AIS Reception
AIS signal reception is turned on by default.
From the Home screen, select
AIS > Off.
All AIS functionality on all charts and on all 3D chart views
is disabled. This includes AIS vessel targeting and tracking,
collision alarms that result from AIS vessel targeting and
tracking, and information about AIS vessels.
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Projected course
Heading line
Configure > Other Vessels >
Showing AIS Vessels on a Chart or on a 3D Chart View
AIS requires the use of an external AIS device and active
transponder signals from other vessels.
You can configure how other vessels appear on a chart or on a 3D
chart view. The display range configured for one chart or one 3D
chart view is applied only to that chart or to that 3D chart view. The
details, projected heading, and trails settings configured for one
chart or one 3D chart view are applied to all charts and to all 3D
chart views.
Note: The Mariner's Eye 3D chart is available if you use a
BlueChart g2 Vision SD card. The Fishing chart is available if you
use a BlueChart g2 Vision SD card or a BlueChart g2 SD card, or if
your built-in map supports Fishing charts.
1. From the Home screen, select Charts.
2. Select Navigation Chart, Fishing
Mariner's Eye 3D.
3. Select Menu > Other Vessels
4. Complete an action:
• Select AIS Display Range
location within which AIS vessels appear. Select a distance
Show All.
or select
• Select Details > Show to show details about AIS-activated
vessels.
GPSMAP 620 and GPSMAP 640 Owner's Manual
Chart, Perspective 3D, or
> AIS Display Setup.
to indicate the distance from your