You are standing a radio watch aboard the rig. A crew boat calls you on VHF channel 16. When you reply with your vessel name and call letters, you should request the crew boat to switch to which of the following channels?

Correct Answer: Option B — 10

VHF channel 16 is strictly designated for international distress, safety, and calling. Once initial contact is established on channel 16, stations must immediately shift to an authorized working channel, such as channel 10, for conversational business to keep the calling channel clear.