Brig Brig A brig is a two-masted vessel with both masts square rigged . On the aft mast, the main mast, there is also a gaff sail , in some languages referred to as the brig sail but in English often called the spanker .
Some brigs have the gaff sail rigged on a separate mast just a bit astern of the main mast.
This mast is called the snow mast , and such a brig is called a snow brig . Brigs that are currently in service include the Astrid and the Royalist .