USCG Exam PracticeThree-bearing fix and cocked-hat triangle
A navigator takes a bearing to a lighthouse, steams a timed distance on a steady course, then takes a second bearing to the same lighthouse. The first LOP is advanced along the DR track to the time of the second observation. What type of position does the intersection of the advanced LOP and the second LOP produce?
- ✓ A running fixCorrect
- B. A simultaneous two-object fix
- C. A three-bearing fix
- D. A danger bearing
Why A is correct
When only one object is available, advancing the first LOP along the DR track to the time of the second observation and intersecting it with the second LOP produces a running fix. It is less reliable than a simultaneous fix because it assumes course and speed were held exactly. (Bowditch Ch. 7 §708)
Cited:Bowditch Ch. 7 §708