56 GPSMAP 4000 Series Owner’s Manual
Digital Selective Calling
dSC
Position Tracking
When you connect your Garmin chartplotter to a VHF radio using NMEA 0183, you can track
vessels that send position reports. This feature is also available with NMEA 2000, provided that the
vessel sends the correct PGN data (PGN 129808; DSC Call Information).
Every position report call received is logged in the DSC list (page 32).
To view a list of position reports:
1. From the Home screen, select Information > DSC List.
2. Select an option:
Select Call with Radio to set up an individual routine call (page 57) with the radio to call the
vessel that sent the position report. This option is available only if you are using a Garmin
NMEA 2000-compatible VHF radio.
Select Edit to edit the vessel name and add a comment. If your radio is tracking the position
of the vessel, select Trail to show or hide the trail line for the vessel, and select Trail Line to
change the line color.
Select Clear Report to delete the call report.
Select Navigate To to Go To or Route To the location sent with the position report (page 23).
Select Create Waypoint to set a waypoint at the location sent with the position report.
Select Next Page or Previous Page to toggle between details of the position report and a
Navigation chart marking the location.
Conguring Vessel Trails on the Navigation Chart
If you have your chartplotter congured to show trails, the Navigation chart displays a black dot
for each reported position, a black line indicating the path of the vessel, and a Blue Flag symbol
indicating the last reported position.
Vessel trail
Last-reported
vessel position
Position-report
location
Vessel Trail
To set the duration of displayed trail points:
1. From a chart screen, select Menu > Other Vessels > DSC > DSC Trails.
2. Select the number of hours to show tracked vessels on the Navigation chart. For example, if you
select 4 Hours, all trail points that are less than four hours old for tracked vessels are displayed.
To turn trail lines off for tracked vessels:
1. From a chart screen, select Menu > Other Vessels > DSC > DSC Trails.
2. Select Off to turn trails off for every vessel.
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