On which channel are radio checks typically conducted?

Radio checks are typically conducted on Channel 22A. This channel is designated as a working channel for non-distress communication and is commonly used for vessel-to-vessel and vessel-to-shore communications, including routine checks of equipment functionality.

Channel 16, on the other hand, is primarily reserved for distress and calling purposes. It is critical for emergencies and should remain free for that use. Therefore, using it for routine radio checks is not advisable, as it could hinder emergency communications.

Channel 70 is designated for Digital Selective Calling (DSC) and is not used for voice communication, which further disqualifies it from being suitable for radio checks.

Channel 9 is traditionally used for small craft and is often utilized for non-commercial communication, but it is less formal than Channel 22A and not the preferred choice for conducting radio checks.

By contrast, Channel 22A is recognized in many maritime operations as the appropriate channel to ensure effective and clear communication while checking the radio equipment, thereby ensuring that it is functioning properly without interfering with emergency communications.