What does an automatic identification system (AIS) transponder use to transmit and receive information broadcasts?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 161.975 Mhz and 162.025 Mhz
AIS transponders utilize dedicated frequencies within the VHF maritime mobile band, specifically channel 87B (161.975 MHz) and channel 88B (162.025 MHz), employing GMSK modulation via SOTDMA protocol for robust digital data exchange between mobile stations and shore authorities.
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