Navigation Formula True course = 260 degree. So, course is SW 80 Degree (S 80 W). Sinco = (Dep / Dist)Cosco = (dlat / Dist)Tanco = (Dep / dlat)Dep = (dlong * Cos m’lat) Find out dlat in degree. How?We know, Cosco = (dlat / Dist)So, dlat = Dist * Cosco (Suppose our dist is … Read more

TRS (Tropical Revolving Storms) Plotting Calculation

TRS Plotting Calculation A TRS is moving at 305° T at 16 knots and is estimated to be 160°T at 200′ from a ship with a speed of 10 knots in the present conditions. Find: TRS Plotting Calculation Plot the TRS at 160°T x 200′ (point X scale 40:1)Plot speed vector of the TRS WA … Read more

Rendezvous Calculations on ship

Rendezvous Calculations on ship Cruise vessel – GMT 21 30Cruise vessel speed – 23 knotsFind out next day sunrise at GMT, so Difference between GMT is the time (hour)Total distance = time * speed True course = 260 degree. So, course is SW 80 Degree Find out dlat in degree. How? 0° 275.022° * cos … Read more

Rendezvous Involving Station Keeping

Rendezvous Involving Station Keeping Your vessel is engaged in the Ministry of Defence’s assigned duties. At 0400 GMT Your vessel has been ordered to come 2.5 miles to the port beam of an RFA Vessel to receive stores by helicopter. The RFA vessel is heading 350° T at 10 knots and is bearing 290 T … Read more

Rendezvous Involving Change of Course and Speed

Rendezvous Involving Change of Course and Speed At 1100 hours, ship X with an injured crew on board is bearing 305° T, 48 nm from survey ship Y, which has a doctor on board. The survey vessel is presently steering 240° T at 9 knots. After 1 hour, the survey ship will alter her course … Read more