Final answer:
The true statement about AIS is that it is a system that broadcasts information which can be received by other vessels, aiding in navigational safety. Option D is correct.
Step-by-step explanation:
The statement, d) AIS information is broadcast and can be received by other vessels, is TRUE regarding automatic identification systems (AIS).
AIS is a tracking system used in the maritime world for the exchange of navigational information between vessels and maritime authorities. The system helps in ensuring navigational safety by allowing ships to view marine traffic in their vicinity and thus aids in collision avoidance.
While AIS is important for safety reasons, it is not mandatory for all vessels. Certain classes of vessels such as passenger ships and large cargo ships are required to carry AIS under the regulations set by the International Maritime Organization (IMO). Moreover, AIS mainly operates on Very High Frequency (VHF) digital channels, not on High Frequency (HF).
AIS is indeed used for collision avoidance, but its functions extend beyond that. It can facilitate vessel movement analysis, assist in search and rescue operations, and provide data to maritime security agencies.