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The various complex situations at sea can be broken down into simple relative velocity problems. These situations could be collision avoidance, fleet maneuvering requirements, simple & complex flight operations, closing on to a faster ship, effect of wind/tide on the course made good, etc.

Calculation of Course & Speed from Relative Motion
Closest Point of Approach
Opening / Closing on a Steady Bearing
Changing Station on a Moving Ship
Calculation of True Wind and Flying Course