Speed of advance
Encyclopedia
Speed of advance is the speed a ship would travel through the water at any given shaft (propellor) rotation, not taking into account any external forces such as set and drift
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Set and drift
In navigation set and drift are characteristics of the current or the velocity of water over the ground in which a ship is sailing.Drift is the magnitude, or speed of the current and set is the bearing in the direction the current is flowing. Bearing is measured in degrees clockwise from either...
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