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Position Tracking
When you enable position tracking, the radio uses interval-based position requests to track up to three vessels.
Your radio transmits received position data over the NMEA network, and you can track the vessels using your
Garmin chartplotter (Configuring DSC NMEA Transmissions, page 21).
Selecting Vessels and Activating Position Tracking
Before you can use position tracking, you must have at least one vessel saved in the directory (Directory,
page 18).
1 Select DSC > POS. TRACKING > ADD ENTRY.
2 Select the vessels you want to track.
You can track the position of up to three vessels at one time. If you select a fourth vessel, the radio sounds
an error tone, and you must remove a vessel before you can add a new one.
3 Select BEGIN TRACKING.
appears on the screen when the radio tracks vessels.
Position-Tracking Polling Interval Sequence
Regulations allow transmission of one position-request call every five minutes. When tracking more than one
vessel, the radio alternates calling each vessel in the list at five-minute intervals. If a vessel does not respond to
five consecutive position-request calls, the radio removes the vessel from the position-tracking list.
You can use this table to better understand how the time interval is applied to the vessels in the position-
tracking list.
Vessel Time
Ship 1 0 minutes (immediately when starting position tracking)
Ship 2 5 minutes
Ship 3 10 minutes
Ship 1 15 minutes
Ship 2 20 minutes
Ship 3 25 minutes
Viewing and Deactivating Vessels on the Position Tracking List
You can deactivate vessels that you want to keep in the tracking list, but do not want to actively track.
1 Select DSC > POS. TRACKING > VESSELS.
2 Select a vessel.
3 Select OFF.
Deleting a Vessel From the Position Tracking List
You can delete vessels from the tracking list that you don't plan to track in the future.
1 Select DSC > POS. TRACKING > DELETE.
2 Select a vessel.
3 Select YES.
16 Digital Selective Calling
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