When using a SSB station on 2182 kHz or VHF-FM on channel 16, what must the preliminary call not exceed?

In maritime communication, particularly when using Single Sideband (SSB) on 2182 kHz or VHF-FM on channel 16, it is essential to follow specific protocols to ensure effective and efficient communication. The preliminary call, which is the initial communication to establish contact, must be succinct and to the point to minimize the use of the airwaves, especially during emergency situations.

The correct maximum duration for a preliminary call is 1 minute. This time frame allows operators to convey essential information without overwhelming the communication channel. It is crucial to keep preliminary calls brief to ensure that other vessels and coastal stations can also communicate effectively. Longer calls could interfere with urgent communications, especially in busy maritime conditions where quick responses may be necessary.

Maintaining a 1-minute limit aligns with best practices in radio communication, promoting clarity and urgency while ensuring compliance with regulatory standards set by the FCC and maritime authorities.