PLANE SAILING: DEPARTURE = (D’LONG X COS M LAT DEP)
Parallel sailing is the interconversion of departure and difference of longitude when a vessel is proceeding due east or due west.
PARALLEL SAILING: DEPARTURE =(D’LONG X COS LAT D’ LONG)
Mercator sailing provides a mathematical solution of the plot as made on a Mercator chart. It is similar to plane sailing, but uses meridional difference and difference of longitude in place of difference of latitude and departure.
Find course & Distance:
TAN CO = (D’LONG /DMP D’LAT)
DIST. = (D’LAT / COS CO)
Find Arrival Postion:
D’LAT = (DIST X COS CO)
D’LONG = (TAN CO X DMP)
