What channel should you use to call a radio check?

Channel 16 is designated as the international distress, safety, and calling channel for maritime communication. It is primarily used for initiating contact and can also be used for urgent safety communications. When you are performing a radio check, it's standard practice to use Channel 16 to establish initial communication, as this channel is monitored by Coast Guard and other vessels for emergency calls.

Additionally, using Channel 26 to communicate with the Coast Guard can be useful for operational matters or specific inquiries after the initial contact has been established on Channel 16. This practice helps avoid congestion on the distress channel, ensuring that it remains available for emergency communications.

Thus, the selection that combines the use of Channel 16 for the initial call and Channel 26 for further communications captures the proper protocol for conducting a radio check and aligns with best practices in maritime communication, ensuring both safety and effective use of radio frequencies.