What is VHF Channel 0 used for in UK waters?

A. Ch 0 is the UK Coastguard's dedicated medical advice channel

B. Ch 0 (156.000 MHz) is not a standard marine working channel — it is not used for routine communications. Some references list it as reserved. In the UK, it has occasionally been used for port operations but has no standard leisure application

C. Ch 0 is the backup distress channel used when Ch 16 is congested

D. Ch 0 is used exclusively for marina booking services in Southern England

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

B. To broadcast weather forecasts to other vessels

C. To make telephone calls from the vessel to shore

D. To operate the radar system remotely

A. A GPS waypoint identifier used in coastal navigation

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

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

D. A vessel survey certificate number required by the MCA