What is the MF distress frequency 2187.5 kHz used for in SOLAS?

What is the MF distress frequency 2187.5 kHz used for in SOLAS?

• A. MF distress (secondary MF)
• B. VHF calling
• C. Channel 70 communications
• D. NAV data

Answer: (A)

In SOLAS, distress communications on the MF band use two designated frequencies to ensure a reliable link even if the main channel is crowded. The primary MF distress frequency is 2182 kHz, and 2187.5 kHz serves as the secondary MF distress frequency. This secondary channel provides a backup path for distress and safety communications when the main frequency is unavailable or congested, helping ships and coast stations maintain contact in emergencies. It’s not used for VHF calling, NAV data, or routine MF traffic, which rely on other channels and bands.

In SOLAS, distress communications on the MF band use two designated frequencies to ensure a reliable link even if the main channel is crowded. The primary MF distress frequency is 2182 kHz, and 2187.5 kHz serves as the secondary MF distress frequency. This secondary channel provides a backup path for distress and safety communications when the main frequency is unavailable or congested, helping ships and coast stations maintain contact in emergencies. It’s not used for VHF calling, NAV data, or routine MF traffic, which rely on other channels and bands.