USCG Exam PracticeRunning fix from a single object
A running fix obtained from a single object is considered less reliable than a simultaneous two-object fix primarily because it:
- A. Requires three separate bearing observations rather than two.
- ✓ Assumes course and speed were held exactly between the two observations.Correct
- C. Ignores the effect of compass error on each bearing.
- D. Produces a cocked hat rather than a precise point of intersection.
Why B is correct
Bowditch Ch. 7 §708 states the running fix is less reliable than a simultaneous two-object fix because it assumes course and speed were maintained exactly between the two observations. Any deviation in course or speed introduces error in the advanced LOP.
Cited:Bowditch Ch. 7 §708