USCG Exam PracticeRunning fix from a single object
A vessel is on course 090°T at 10 knots. At 1000, the navigator takes a bearing of 045°T on a lighthouse. At 1030, a second bearing on the same lighthouse reads 000°T. The navigator advances the 1000 LOP to 1030 along the DR track. The result of the intersection of the advanced LOP and the 1030 LOP is best described as:
- A. A fix, equal in accuracy to a simultaneous two-object fix
- ✓ A running fix, less accurate than a simultaneous fixCorrect
- C. A dead reckoning position corrected for current
- D. A radar fix derived from range and bearing
Why B is correct
Bowditch Ch. 7 §702 defines this procedure as a running fix and explicitly states it is less accurate than a fix from simultaneous LOPs. The accuracy depends on the assumption that the vessel maintained the planned course and speed during the interval.
Cited:Bowditch Ch. 7 §702