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AIS MOB devices

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Error on the Headway HMT-100. Power supply.

Error on the Headway HMT-100. Power supply.

Error and its elimination on the external display of the black box Headway HMT.

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.