Navigation General · Electronic Nav — DSC
Digital Selective Calling (DSC) distress alerts on VHF are transmitted on:
- AChannel 16
- BChannel 13
- CChannel 70✓ Correct
- DChannel 06
Explanation
VHF Channel 70 is reserved exclusively for DSC (digital) calls, including the distress alert. Voice distress communication then follows on Channel 16. A registered MMSI lets the DSC alert carry the vessel's identity and (with GPS) position.
Authority: ITU Radio Regulations; GMDSS
Practice the full Navigation General bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Navigation General questions
- Dead Reckoning
A vessel departs a known position at 0800 on course 090°T at 12 knots. What is the DR position at 1100?
- Time-Speed-Distance
Using the 60 D = S × T formula, how long will it take a vessel traveling at 15 knots to cover 45 nautical miles?
- Time-Speed-Distance
A vessel travels 90 nautical miles in 6 hours. What is the vessel's speed?
- Dead Reckoning
Which of the following is the best definition of a Dead Reckoning (DR) position?
- Set & Drift
A vessel steers 000°T at 10 knots for 2 hours. The observed position shows the vessel is 4 nm east of the DR position. What is the set and drift of the current?
- Set & Drift
A current has a set of 225°T and a drift of 2 knots. Over 3 hours, how far and in what direction will this current displace a vessel from its DR position?