Navigation General · Set & Drift
A vessel steers 060°T at 15 knots for 2 hours. The observed position shows the vessel is 6 nm north of the DR position. What is the set and drift of the current?
- ASet 000°T, drift 3.0 knots✓ Correct
- BSet 180°T, drift 3.0 knots
- CSet 000°T, drift 1.5 knots
- DSet 090°T, drift 3.0 knots
Explanation
The vessel is displaced 6 nm north of its DR over 2 hours. Set = direction toward which current flows = 000°T (north). Drift = displacement / time = 6 nm / 2 hr = 3.0 knots.
Authority: Bowditch (Pub. 9), Ch. 7
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
- 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?
- Set & Drift
Over a 4-hour run, a vessel was set 8 nm in the direction 045°T from its DR position. What is the drift of the current?
- 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?