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by tastyfreeze
1905 days ago
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AIS transmission frequency and message contents are dependent on nav status and speed. Nav status is set by humans. Beyond a certain speed AIS ignores nav status and transmits underway messages at underway frequency. Its been a few years since I've had to read the specs so I dont quite remember the details of what changes in message contents. Im guessing that you are seeing some vessels that havent set an underway nav status. |
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