The tactical diameter of a ship is the distance:
- travelled on sea surface
 - during a turning circle test
 - with maximum rudder angle
 - by the center of gravity of a ship
 - taken perpendicular to the initial track followed at approach speed
 - when the heading has changed by 180°
 
The ratio of the tactical diameter divided by the ship's length between perpendiculars gives a dimensionless parameter which can be used to compare ships maneuverability.
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