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Sheldon Haynie

Class B Transmit interval/trigger?

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Reading the Class B specifications ( , there's a Message 18 transmission interval that's SOG dependent ( That makes sense as you need more frequent updates at higher speeds.

The question is about triggering a transmission on course changes?
Class A is apparently configured to do so, but have not found documentation for Class B.

We raced Wednesday Night and I retrieved this track from

Our speeds were 3-6 kts SOG except during tacks, where we might drop to 2. It pretty clearly shows all of the tacks, buoy roundings and most of the times I can recall bearing away on the course. There are intermediate positions which would be consistent withtime intervals, and I would expect that Marinetraffic downsamples to give a cleaner track.

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