USCG Exam PracticeRunning fix from a single object
You are steaming on course 045°T at 10 knots. At 1000 you take a bearing of 090°T on a lighthouse. At 1012 you take a second bearing of 060°T on the same lighthouse. To obtain a running fix, you must advance the 1000 LOP by what distance along the DR track?
- A. 10.0 nautical miles
- ✓ 2.0 nautical milesCorrect
- C. 5.0 nautical miles
- D. 12.0 nautical miles
Why B is correct
The elapsed time between observations is 12 minutes. At 10 knots, distance run = (10 × 12) / 60 = 2.0 nautical miles. Per Bowditch Ch. 7 §708, the first LOP is advanced along the DR track by the distance run between the two bearings.
Cited:Bowditch Ch. 7 §708