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DSC Operations Flashcards

7 cards from real RYA SRC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. When sending a DSC distress alert, which channel is used for the subsequent voice distress call?

    Answer: Channel 16

    After a DSC distress alert is sent on Channel 70, the voice distress call and communications are conducted on Channel 16.

  2. What does the term 'MMSI' stand for in DSC operations?

    Answer: Maritime Mobile Service Identity

    MMSI stands for Maritime Mobile Service Identity, a unique nine-digit number assigned to a vessel's radio equipment for DSC identification.

  3. A DSC urgency call uses which category?

    Answer: Urgency

    An urgency call is preceded by the PAN PAN signal and uses the Urgency category in DSC, which is one level below Distress.

  4. How many digits make up a vessel's MMSI number?

    Answer: 9

    An MMSI number consists of exactly nine digits and uniquely identifies a ship station or group of ship stations.

  5. Which nature of distress code would you select on DSC if your vessel is sinking?

    Answer: Flooding

    Flooding is the correct DSC nature of distress code to select when a vessel is sinking or taking on water.

  6. After sending a DSC distress alert, you should listen on Channel 16 and wait how long before sending a further alert if no acknowledgement is received?

    Answer: 3.5 minutes

    If no DSC acknowledgement is received, the alert can be repeated after approximately 3.5 minutes while continuing to listen on Channel 16.

  7. When a DSC distress relay call is sent by a vessel on behalf of another vessel in distress, what must be included?

    Answer: The MMSI of the vessel in distress

    A DSC distress relay must include the MMSI of the vessel that is in distress, along with the distress details received.

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Sources & references

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  1. rya.org.uk — Score release, eligibility, fees, exam format, registration deadline, test delivery · verified Oct 2026