You hear "SILENCE MAYDAY" transmitted by the Coastguard on Ch 16. What does this mean?

A. A Mayday has been cancelled — normal communications may resume

B. All vessels must switch to Ch 67 and maintain silence there

C. "SILENCE MAYDAY" (Seelonce Mayday) — all stations must immediately cease transmitting on Ch 16; the Coastguard is controlling communications with a vessel in distress and must not be interrupted

D. "Silence Mayday" is only broadcast by the vessel in distress — the Coastguard uses a different format

A. To operate the radar system remotely

B. To broadcast weather forecasts to other vessels

C. To make telephone calls from the vessel to shore

D. To send a digitally coded distress alert containing the vessel's MMSI and position automatically to all DSC-equipped stations and the Coastguard

A. Maritime Mobile Service Identity — a unique 9-digit number identifying the vessel; without it a DSC distress alert cannot identify the vessel to rescuers

B. A GPS waypoint identifier used in coastal navigation

C. A VHF channel number allocated by Ofcom for distress use only

D. A vessel survey certificate number required by the MCA