Maritime QuestionsSrc Vhf

Your DSC controller receives a distress alert from another vessel. What should a leisure yacht do before acknowledging on DSC?

A. Immediately send a DSC acknowledgement on Ch 70 — this is the required first action
B. Take no action — only the Coastguard is permitted to acknowledge a distress alert
C. Acknowledge on Ch 16 by voice immediately without waiting
D. Wait briefly to see if the Coastguard acknowledges first — if no shore acknowledgement is heard within 5 minutes, then acknowledge on Ch 16 by voice; do NOT immediately send a DSC acknowledgement as this may block the Coastguard's response
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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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