Apr 2025 PM TCN
Q.1) At 0900 hrs while steering 300°(T) at 12 kts East Channel Racon Buoy bore 180°(T) x 5 n.m. At 0930 hrs vessel A/Co to starboard and reduced speed to 10 kts and maintained same speed throughout thereafter. At 1030 hrs vessel A/Co to 050°(T). At 1100 hrs Bill of Portland (50° 31’N, 002° 27’W) bore North. If current is expected to set Easterly at 2 kts, find vessel’s position at 1100 hrs and course between 0930 hrs and 1030 hrs.
Answer:
Course between 0930 & 1030 hrs – 351°T
Position @1100 Hrs – 50°20.3’N; 002°27.4’W
Q.2) A vessel is steering 000°(T) at 12 kts and experiencing current setting 270°(T) at 3 kts. At 0600 hrs using position Lat:- 50° 00’N, Long 001° 40’W observation of star ‘X’ gave intercept 2.0’ towards with AZ 330°(T). At 0630 hrs observation of star ‘Y’ gave intercept 1.1’ away from AZ 040°(T), position used for calculation was 0600 hrs DR run up taking into account course, speed, current and drift. Determine the ship’s position at 0630 hrs and her E.P. at 0700 hrs, assuming current to be the same
Answer:
0630 hrs Posn – 500 06.8’N; 0020 46.4’W
0700 EP – 50012.9’N; 0020 48.7’W