USCG Exam PracticeRunning fix from a single object
A vessel is on course 045°T at 10 knots. At 1000 the navigator takes a bearing of 090°T on a lighthouse and plots LOP-1. At 1015 a second bearing of 060°T is taken on the same lighthouse and plotted as LOP-2. What distance is used to advance LOP-1 to obtain the running fix?
- A. 10.0 nautical miles
- B. 5.0 nautical miles
- ✓ 2.5 nautical milesCorrect
- D. 7.5 nautical miles
Why C is correct
Distance run equals speed multiplied by elapsed time. At 10 knots for 15 minutes (0.25 hour), the vessel covers 2.5 nautical miles. LOP-1 is advanced 2.5 NM along the DR track in the direction of travel. Bowditch Ch. 7 §708 and Ch. 8 §801 govern this procedure.