Navigation General · Running Fix
To advance an LOP from 0900 to 1000 for a running fix, the navigator moves the LOP:
- AIn the direction of CMG by the distance made good over the ground✓ Correct
- BIn the direction of the vessel's true heading by distance run through the water
- CPerpendicular to the original LOP by the distance run
- DIn the direction of current set by the drift
Explanation
An LOP is advanced in the direction of CMG (course made good over the ground) by the distance made good (SMG × elapsed time). This accounts for both the vessel's steering and the effect of any current.
Authority: Bowditch (Pub. 9), Ch. 8
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
- Running Fix
A vessel takes a bearing of 045°T on a lighthouse at 1000, then takes a second bearing of 000°T on the same lighthouse at 1030. The vessel made good 090°T at 12 knots between observations. The navigator uses this to obtain a:
- Running Fix
A running fix is generally considered less reliable than a fix from simultaneous bearings because:
- 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?