The Collaborative International Dictionary of English v.0.48:

Sharpie \Sharp"ie\, n. (Naut.)
   A long, sharp, flat-bottomed boat, with one or two masts
   carrying a triangular sail. They are often called Fair Haven
   sharpies, after the place on the coast of Connecticut where
   they originated. [Local, U.S.]
   [1913 Webster]