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 morePlane Parallel Mercator Sailing Formula
Trim or Longitudinal Stability A ship is floating in salt water at drafts of 6.7 m F and 7.3 m A. MCT 1 cm 250 tonnes m. TPC 10 tonnes. The length of the ship is 120 meters. The center of flotation is amidships; 220 tonnes of cargo is then discharged from a position 24 … Read moreTrim or Longitudinal Stability (Derrett Stability)
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 moreNavigation Formula
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 moreTRS (Tropical Revolving Storms) Plotting Calculation
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 moreRendezvous Calculations on ship