What are Advance, Tactical Diameter, Transfer and Tactical Diameter?

Advance:

This is the distance travelled by the ship’s centre of gravity in a direction parallel to the ship’s initial course. It is usually quoted for a 90º change of heading.

Transfer:

This is the distance travelled by the ship’s centre of gravity in a direction perpendicular to the ship’s initial course. It is usually quoted for a 90º change of heading.

Tactical diameter:

This is the distance travelled by the ship’s centre of gravity in a direction perpendicular to the ship’s initial course when the ship has altered its course by 180º and is on a reciprocal heading.

Steady turning circle radius:

This is the steady radius of the turning circle when a steady rate of turn is achieved. This state is usually achieved by the time the ship has altered course between 90º and 180º however this will vary from ship to ship.

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