What should you do if you have transmitted a distress call a number of times on channel 16 and have received no reply?

Correct Answer: Option C — Repeat the message using any other channel on which you might attract attention.

Radio propagation limits and channel saturation on VHF Channel 16 necessitate shifting frequencies when initial distress calls go unanswered. Under GMDSS and ITU Radio Regulations, operators should immediately utilize alternative frequencies capable of attracting attention, such as other VHF working channels or MF/HF frequencies, to ensure distress traffic is successfully received.