Maritime Questions › Src Vhf

An EPIRB is activated in a real emergency but was never registered with Ofcom/MCA. What is the practical consequence?

A. The 406 MHz signal is received by COSPAS-SARSAT but the MMSI/Hex ID returns no vessel information — Coastguard must spend time trying to identify the vessel before launching a full response, significantly delaying rescue
B. An unregistered EPIRB will not transmit — registration activates the beacon
C. The Coastguard treats all unregistered EPIRBs as test signals and does not respond
D. There is no practical difference — position is transmitted regardless of registration
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What is the primary purpose of DSC (Digital Selective Calling) on a VHF radio?
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
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What is an MMSI number and why must it be programmed into a DSC radio before it is used?
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
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