Track reach , head reach / stopping distances ?

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Stopping ability is measured by the “track reach” and “head reach” realized in a stop engine-full astern maneuver performed after a steady approach at the test speed until ahead speed in ship coordinates changes sign

Track Reach is defined as a distance along the vessel’s track that the vessel covers from the moment that the “full astern” command is given until ahead speed changes sign.

Head Reach is defined as a distance along the direction of the course at the moment when the “full astern” command was given. The distance is measured from the moment when the “full astern” command is given until the vessel is stopped dead in the water.