Turning Circle: The path described by a ship’s pivot point as it executes a 360° turn.
Advance: When a ship is turning the distance travelled by centre of gravity along the original course.
Transfer: Distance travelled by COG measured from the original track to the point where the vessel has altered her course by 90 degrees.
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Tactical Diameter: It is the transfer for 180 degree.
Stopping Distance: It is the minimum distance that a vessel requires to come to rest over the ground.
Inertia Stop: Distance covered by the vessel when the command is given from Full Ahead to Stop keeping the rudder mid-ship.
Crash Stop: Distance covered by the vessel when the command is given from Full Ahead to Full Astern keeping the rudder mid-ship.
Head Reach: Distance along the direction of the course that it covers from the moment the full astern commands is given until ahead speed changes sign
Track Reach: Distance along the vessel track that it covers from the moment astern command is given until ahead speed changes sign.
Drift Angle: Angle between ship’s fore and aft line and the tangent to the turning circle.
Ref: Polaris App
