USCG Exam PracticeDead reckoning — DR plot maintenance
A vessel steers C 270 at S 6 for 2 hours from a 0800 fix. At 1000 the navigator lays off a current vector of set 180, drift 2 kt from the DR position. The resulting symbol plotted at the end of that vector is a ______.
- A. dot inside a circle labelled 1000
- ✓ dot inside a square labelled 1000Correct
- C. dot with a semicircle labelled 1000
- D. cross inside a circle labelled 1000
Why B is correct
Applying set and drift to the DR position produces an estimated position, symbolized by a dot inside a square. A dot inside a circle is a fix; a dot with a semicircle is a DR position. All positions are labelled with 24-hour time.