NAVIGATION

Interpolation of Times and Height (Secondary Port Tide) Interpolation Methods for Tidal Times Interpolation Methods for Tidal Height

Calculated Tide of a Secondary Port (Overhead Power Cable) Charted clearance of an overhead power cable is 62.3 meters above MHWS at Bournemouth (ATT Vol. 1, 37) What will be the clearance of the ship’s mast while passing the cable at 0930 hrs GMT on 20th Nov? Assuming the mast height was 57.8 meters from … Read more

Rendezvous Position Sunrise At 0450 GMT on 18 June 2006, a tanker in position 39° 42′ N, 145° 06′ W has an injured seafarer requiring urgent medical attention onboard. At the same time a passenger vessel in position 40° 00′ N, 148° 07′ W heading 076° T at 26 knots, has a doctor on board … Read more

Final and Initial course angle of a great circle course between two geographical positions DRAW POLE IFIF N > S ; DRAW NORTH POLEIF S > N ; DRAW SOUTH POLEIF BOTH N ; DRAW NORTH POLEIF BOTH S ; DRAW SOUTH POLE IF ICA AND FCA SAME QUADRANTS VERTEX LIES OUTSIDE A AND BAND … Read more

Parallel Sailing Find the distance travelled by a ship on a course of 090° T at latitude 45° N. If its longitude changed by 20°. If latitude was 60° N, find the distance. 20° = 20 * 60 = 1200′ of arc For 45° N: dep = dlong * cos lat = 1200 * cos … Read more