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AIS MOB devices

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Power sources (extract from the rules)

Power sources (extract from the rules)

Power sources (extract from the rules)

These are similar to PLBs, but transmit an AIS message via VHF with a range of up to four miles depending on the sea state. Once activated, the device emits a signal with a GPS position. This appears on an AIS receiver screen as a red circle with an X inside and a bearing and distance to the unit.