The Collaborative International Dictionary of English v.0.48:

Heel \Heel\ (h[=e]l), v. i. [OE. helden to lean, incline, AS.
   heldan, hyldan; akin to Icel. halla, Dan. helde, Sw.
   h[aum]lla to tilt, pour, and perh. to E. hill.] (Naut.)
   To lean or tip to one side, as a ship; as, the ship heels
   aport; the boat heeled over when the squall struck it.
   [1913 Webster]

   Heeling error (Naut.), a deviation of the compass caused by
      the heeling of an iron vessel to one side or the other.
      [1913 Webster]