USCG Exam PracticeRunning fix from a single object
When plotting a running fix from a single object, which assumption makes this method less reliable than a simultaneous two-object fix?
- A. The object must be identified on the chart before the first bearing is taken.
- B. The two bearings must differ by at least 90 degrees to produce a valid fix.
- ✓ The course and speed were held exactly between the two observations.Correct
- D. The elapsed time between bearings must not exceed one hour.
Why C 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 held exactly between the two observations. Any deviation in course or speed introduces error into the advanced LOP.
Cited:Bowditch Ch. 7 §708