Navigation General · AIS
Which of the following items of information is NOT transmitted by a Class A AIS transponder?
- AMMSI number
- BTrue heading
- CCurrent radar image✓ Correct
- DNavigational status (underway using engine, at anchor, etc.)
Explanation
AIS transmits vessel identification (MMSI, name, call sign), position (lat/lon), COG, SOG, true heading, ROT, navigational status, voyage data (destination, ETA, draft), and vessel dimensions. AIS does NOT transmit radar imagery — radar and AIS are entirely separate systems. AIS operates on VHF digital channels, while radar uses microwave frequencies.
Authority: Bowditch (Pub. 9), Ch. 13
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