Jan 2023 TCN

Q.1) A vessel steering 084°C allowing for a current setting 234°T at 2.4knots observed Berry Head Lt. (50° 24’N 003° 29’W) bearing 348°C and Start Pt. Lt. (50° 13’N 003° 38’W) bearing 245°C. Find the vessel’s positions and estimate the relative bearing and distance off Bill of Portland Lt. (50° 30.8’N, 002° 27.4’W) on first sighting. Meteorological visibility is estimated to be 5 miles.

Answer:

HSA Between Berry Head Lt and Start Pt. Lt – 103° / Complementary Angle – 13°
Ships heading – 084° C
Deviation – 12.5° (Deviation table 2)
Variation – 7°40’ (1979) decreasing 5’ Annually – 3.8° (Calculated For 2025)
Ships heading – 068°T

Bill of Portland Lt.
Geographical Range – 2.095√10+2.095√43=20.4M
Nominal Range – 29M
Luminous Range – 16.4M

Vessel Position on First sighting – 50°24.9’N; 002°51’W
Relative bearing – 000°R
Distance off – 14.6 m

Q.2) At 0830 hrs, Anvil Pt. Light House (50° 35.5’N, 001° 57.6’W) was 7 miles off and at 0936 hrs. Bill of Portland Light was 8 miles off. Vessel steered a course of 260° (T) during this interval and the engine speed was 9 Knots during this interval. The current was setting 185°(T) at 1 knot. Find:
a) Ship’s position at 0830 hrs
b) Ship’s position at 0936 hrs.
c) Course made good by her in this period.

See July 2023 AM, Same Question only timing is different

Q.3) Plan a passage from Needles Channel Pilot stn to 5nm East of Start Point, considering the ship’s Draft to be 15m & using the Traffic Separation Scheme.

Plan the Passage as per Question