The AIS system uses time division multiple access (TDMA) to transmit messages. The VegaAIS Type 1 uses Fixed Access TDMA (FATDMA) where time slots are reserved by a local AIS base station.
The VegaAIS Type 3 can either use FATDMA or Random Access TDMA (RATDMA) where communication slots are not required to be reserved by a AIS base station. In the Type 3 unit each AIS message can be configured to transmit as a FATDMA or RATDMA message.
In addition to monitoring information, the VegaAIS unit can transmit the details of up to three virtual ATON locations.
The VegaAIS unit supports collision monitoring and “On Demand” operation of the ATON. A Type 3 unit is required in order to be able to receive the information to perform and report these features.
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