USCG Exam PracticePlot true course and distance between two charted points
A running fix differs from a standard fix primarily because:
- A. It uses only a single line of position rather than two or more
- ✓ The first LOP is advanced along the DR track to the time of the second observationCorrect
- C. It requires simultaneous bearings to two charted objects
- D. It is derived from the doubling-the-angle technique using a single relative bearing
Why B is correct
A running fix is obtained when LOPs cannot be taken simultaneously. The first LOP is advanced along the DR track to the time of the second observation, and the intersection of the advanced LOP with the second LOP is the running fix. This makes it less accurate than a fix from simultaneous LOPs.
Cited:Bowditch Ch. 7 §702