Composite Great Circle Formula UK Set

Composite Great Circle Formula UK Set A Composite great circle track between Montevideo (34° 35′ S 056° 10’W) and Cape town (33° 55′ S 18°25’E) is required with a limiting latitude of 38°. Find the initial course and the total distance to the steam. Composite Great Circle Formula UK Set Dlong = 74° 35′ E … Read more

Compass Errors by Sun

Compass Errors by Sun At 1540 LMT, on 14th August 1991, the officer of the watch of a vessel in position 27°18’S 038°47’W observed the sun to check compass errors, He obtained the following bearing: 321.5°C, 303° G. If variation is 23°W find each of the following:  a) The gyro compass error. b) The error … Read more

Composite Great Circle Sailing

Composite Great Circle Sailing On 5 March 2005 at 1200 hours local time, a vessel is expected to depart from port Elizabeth (South Africa) to arrive at Melbourne (Australia) with a General average speed of 12.5 knots. The Master intends to follow a composite great circle track with a limiting latitude of 42° S from: … Read more

Tide Calculation for Secondary Port Dungeness

Tide Calculation for Secondary Port Dungeness The height of a Lt. Ho. at Dungeness (ATT Vol.1, 87) is charted as 40m. What height would you use when taking a vertical sextant angle at 1800 GMT on June 8th? Tide Calculation for Secondary Port Dungeness Since the range is not same as spring or neap, interpolation … Read more

Tide Calculation for Secondary Port Patrick

Tide Calculation for Secondary Port Patrick A vessel of 8.00 m mean draft wanted to pass over a shoal of 8.3 m with 0.5 m safety margin in AM tide on 2nd February 1991 on the approach to port Patrick. What is the earliest time at which she could do that? (ATT 415) Required depth … Read more