DuckCorp Dico

Found one definition

1.                 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]