Maritime QuestionsSrc Vhf

How do you make a DSC individual (non-distress) call to a specific vessel?

A. Call the vessel by name on Ch 16 — DSC individual calls are only for commercial vessels
B. Enter the other vessel's MMSI in the DSC controller; select the working channel you propose; send the individual call on Ch 70 — the other vessel's DSC will alert the crew, who switch to the agreed working channel for voice communication
C. Send a DSC individual call on Ch 16 and wait for acknowledgement on Ch 70
D. DSC individual calls require Coastguard authorisation for leisure vessels
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What is the primary purpose of DSC (Digital Selective Calling) on a VHF radio?
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
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What is an MMSI number and why must it be programmed into a DSC radio before it is used?
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
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