WordReference Random House Unabridged Dictionary of American English © 2019
great-circle sail′ing  (grātsûrkəl),USA pronunciation [Navig.]
  1. Nautical, Naval Termssailing between two points more or less according to an arc of a great circle, in practice almost always using a series of rhumb lines of different bearings to approximate the arc, whose own bearing changes constantly unless it coincides with a meridian or the equator.

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