From The Collaborative International Dictionary of English v.0.48:

Westing \West"ing\, n. (Naut. & Surv.)
   The distance, reckoned toward the west, between the two
   meridians passing through the extremities of a course, or
   portion of a ship's path; the departure of a course which
   lies to the west of north.
   [1913 Webster]
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