Deck General · Shiphandling — Turning Circle

In a turning circle, the 'advance' is the distance the vessel travels:

Explanation

Advance is measured along the original course line from the point the rudder is put over to where the head has turned 90°. Transfer is the perpendicular distance from the original course, and tactical diameter is the maximum width at a 180° turn.

Authority: Bowditch; Knight's Modern Seamanship

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