Jan 2020 TCN
Q.1) A vessel anchored off Ystad observes the followings bearings:
Abbekas Lt. (56° 23’N, 013° 37’E) 298°(C)
Ystad South Lt. (55° 25’N, 013° 49’E) 009°(C)
Kasebarga Lt. (55° 23’N, 014° 04’E) 078°(C)
Find the position of the ship and compass error if it was the same for all three observations. From this position, find the compass course to steer to pass Hammerodde light (55° 18’N, 014° 47’E) at a distance of 2 miles, countering a current setting 060°(T) x 2 knots and a strong N’ly wind causing a leeway of 5.
Answer:
HSA Btw Abbekas Lt. & Ystad South Lt. – 071° / Complementary Angle – 019°
HSA Btw Ystad South Lt. & Kasebarga Lt. – 069° / Complementary Angle – 021°
Vessel Position: 55°20.5’N; 013°48.5’E
Compass Error – 3.5°W
CMG – 091°(T)
Course to Steer – 098° T (Without Counteracting leeway)
Course to Steer – 093° T (Counteracting leeway)
Compass Course to Steer – 096.5° C
Q.2) 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 8.5 m, height of tide 1.5 m). Find the ship’s position at 2130 hours and set and rate of current.
Answer:
CTS to have Hano Lt 4 points on Port Bow – 349°T
Ship Posn @2130 Hrs – 55°48.2’N; 015°06.4’E
Set & Rate – 294°T x 1.4 kts
Q.3) A vessel steering 130° (T) observed Kuala Grund Racon (55° 18’ N, 013° 20’ E) at 1900 hrs bearing 072°(T). At 1920 hrs, the same light bore 044°(T) and at 1950 hrs, it bore 352°(T). If the current was setting 080°(T). Find:-
a) Course Made Good & Rate of Current.
b) Ship’s Position at the time of final bearing.
From this position plan a passage to reach the VTS off OLAND’s SODRA GRUND (56O 04’ N, 016O 41’ E).
Answer:
1950 Hrs Posn – 55°08.1’N; 013°22.0’E
CMG – 119°T
Rate – 3.6 Kts
From the above Position plan the Passage
Note: This Question is same as July 2023 PM & only the hours are different.