July 2023 PM TCN
Q.1) A vessel observes Christianso Island Main Light (55° 19.2’ N, 015° 11.6’E) bear 270°(T) x 5 miles off at 1930 hours. Find the course to steer to have Hano Light (56° 00.8’N, 014° 51’E) 4 points on port bow when it is 12 miles off. At 2130 hours while on this course at a speed of 14 knots the echo sounder recorded a sounding of 10m below keel (ship’s draft even keel 8.5m, height of tide 1.5m). Find the set and rate of current.
Answer:
See Jan 2020
Q.2) A vessel steering course 005° (T) at 12 knots observes bearings of Dueodde light to be 224°(C) and Svaneke light as 290°(C) at 2200 hrs. The current in the area was setting 082° (T) at 3 knots. After sailing for 35 minutes the compass bearings of Svaneke and Chritiano North Light were 226°(C) and 324° (C) respectively. Find CMG, SMG, position at 2200 hrs and 2235 hrs.
Answer:
HSA Between Dueodde light & Svaneke light – 66° / Complementary Angle – 24°
HSA Between Svaneke light & Chritiano North Light – 98° / Complementary Angle – 8°
CMG – 009°T
SMG – 13 Kts
2200 Position: 55°07.5’N; 015° 14.8’E
2235 Position: 55° 14.7’N; 015° 19.2’E
Q.3) A vessel steering 130° (T) observes Kuala Grund Racon (55° 18’N, 13° 20’E) bearing 072° (T) at 2100 hrs. At 2120 hrs the same light bore 044° (T) and at 2150 hrs it bore 352° (T). Find the vessel’s position at 2150 hrs, the Course made good and the rate of current if current set 080° (T).
Answer:
2150 Hrs Posn – 55°08.1’N; 013°22.0’E
CMG – 119°T
Rate – 3.6 Kts