TURNING CIRCLE :when a vessel is made to turn under a contionous helm through 360 deg it will follow a roughly circular track called turning circle
ADVANCE : It is the distance travelled by ship along original course line when she alter her course through 360 deg
TRANSFER : It is the distance travelled by the ship measued from original course line to the point when she alter her couse by90 deg
TACTICAL DIAMETER : It is the distance travelled by the ship measured from original course line to the point when she alter her course by 180 deg
DRIFT ANGLE : It is the angle between the ship fore and aft line and tangent drawn to the turning circle
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