When is a Sécurité message transmitted on VHF and on which channel?

A. To broadcast a navigational or meteorological warning — e.g. a floating container, unlit vessel, or debris reported — transmitted on Ch 16 (or as directed by Coastguard, typically Ch 67 in UK)

B. To request a radio check from another vessel

C. To report a vessel in distress on behalf of the casualty

D. To cancel a Mayday call when the vessel is safe

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