What is the primary use of VHF Channel 16?

• A. Channel 16 is the primary calling and distress channel; after establishing contact, switch to a working channel.
• B. Channel 16 is used for weather updates only.
• C. Channel 16 is a private channel for captains.
• D. Channel 16 is used for internal onboard communications.

Answer: (D)

VHF Channel 16 is the international calling and distress channel. It’s the channel ships use to hail each other and to initiate contact, and it’s monitored for emergencies. Once you’ve established communication on Channel 16, switch to a working channel for the actual conversation so that Channel 16 remains clear for new calls and distress traffic. Weather updates aren’t the primary purpose of Channel 16; they’re obtained through other services. It’s not a private channel for captains, nor intended for routine internal onboard communications.