July 2021 TCN
Q.1) At 1800 hrs from DR position lat 55° 03’ N long 016° 28’E, a vessel obtains an intercept of 2’
towards on an Azimuth of 009°. She was steering a course of 330°T at 12 Kts. Thereafter the visibility
became poor. If the current in the area is 060°(T) at 2 Kts, when and what should be her next
alteration of course so as to pass 6 miles on the northern side of Christiano Island Main Light (Lat 55°
19.2’ N Long 015° 11.6’E).
Answer:
Q.2) A vessel observes Christianso Light (55° 19.2’N, 015° 11.6’E) bear 270°(T) 5 miles off at 1900
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 2100 hours while on this course at a speed of 11 knots the echo sounder recorded
a sounding of 10m below keel (ship’s draft even keel 9.0m, height of tide 2m). Find the ship’s position
at 2100 hours and set and rate of current.
Answer:
2100 Position: 55°48.2’N; 015°06.8’E
Set – 332°T
Rate – 3.8 Kts
Q.3) A vessel at anchor South of YASTAD observed the following compass bearings:
Sandhammaren (55° 24’ N, 14° 10’E) 067°C
Yastad (South) (55° 25’ N, 13° 49’E) 010°C
Abbekas (55° 23’ N, 13° 16’E) 320°C
Find the vessel’s position and compass error. From this position, plan a passage to reach the VTS off
OLAND’s SODRA GRUND (56° 04’N, 16° 41’E) via KARLSHAMM (56° 10’ N, 14° 52’ E) where she has to go for discharging a small parcel of cargo.
Answer:
HSA Btw Sandhammaren & Ystad (South) -057° / Complementary angle – 33°
HSA Btw Ystad (South) & Abbekas – 050° / Complementary angle – 040°
Vessel Position: 55° 16.8’N; 013° 47’E
Compass Error: 1° W
From this Position Plan the passage