Oct 2020 TCN

Q.1) A vessel while steering a course 034°(T) observes Lundy Island South Lt. (51° 09’N 004° 39’W) for the first time at 2000 hrs. The visibility at this time was 5 miles. The light was obscured at 2036 hrs. If the current was setting 338° (T) at 3 knots, find:
a) Position of the vessel at 2036 hrs.
b) Course & speed made good.

Answer:

Geographical Range – 2.905√10+2.095√53 = 21.9M
Nominal Range – 24M
Luminous range – 14.2M

a) 2036 hrs Position: 51°23.8’N; 004°37.0’W
b) CMG – 017° T / SMG – 14.2 kts

Q.2) At 0600 hrs, UTC on 2nd Feb. 1972, a vessel anchored at Carmarthen Bay observes the following:
Watch Tower (51° 42’N 004°20’W) – 045°(C)
Rhossili Down Tr. (189) (51° 35’N 004°17’W) – 118°(C)
Helwick Lt. Vessel (51° 31’N 004°25’W) – 180°(C)
Find the (a) Compass error (b) Position of the vessel.

Answer:

HSA Btw Watch tower & Rhossili Down Tr. – 073° / Complementary Angle – 017°
HSA Btw Rhossili Down tr. & Helwick Lt. Vsl – 062° / Complementary Angle – 028°

Vessel Position: 51°37.7’N; 004°26.2’W

Q.3) A vessel having a draft of 11m drops pilot at Bristol Pilot Grounds (51°21’N 003° 19’W) in gale force
winds and is bound for Swansea (51° 32’N 003° 57’W) while the vessel is equipped with ARPA, Echo Sounder, Doppler Log. She is also experiencing steering problems. In view of the above, plan a safe passage for the intended voyage.

Plan the Passage as per Question