Jan 2024 PM TCN
Q.1) While steering 060O(T) at 12 knots in meteorological visibility of 2NM, a vessel bound for Carmarthen Bay last sighted St. Gowan Lt. (51O 30.5’N, 004O 59.5’W) at 2200 Hrs. At 2245 Hrs/ Caldey Island Lt (51O 38’N, 004O 41’W) first became visible. The current was known to set 330O(T) at 3 knots. Determine the ship’s position at 2200 hrs and 2245 hrs.
Answer:
St Gowan Lt.
Geographical Range – 2.095√12 = 7.3’
Nominal Range – 26M
Luminous Range – 7.2’
Caldey Island Light
Geographical Range – 2.095√12 = 7.3’
Nominal Range – 14M
Luminous Range – 4.6’
2200 Hrs Position: 51°27’N; 004°49.4’W
2245 Hrs Position: 51°33.5’N; 004°38.6’W
Q.2) While steering 300°(T) at 14 kts observed Caldey is Lt (51° 38’N, 004° 41’W) bore 340°(T) at 1200 hrs. At 1250 hrs old castle hd (65) Pt (51° 38.2’N, 004° 47’W) bore 000°(T) and at 1310 hrs Stack Pole Hd Point (51° 37’N, 004° 53.6’W) bore 000°(T) x 6.7’. Find the following:
i) Position of the vessel 1200 hrs
ii) CMG, SMG
iii) Set and Rate of current.
Answer:
i) 51°18.7’N; 004°28.8’W
ii) CMG – 307°T; SMG – 16.1 kts
iii) Set – 341°T; Rate – 2.8 kts