The Bermuda sloop is a type of fore-and-aft rigged sailing vessel developed on the islands of Bermuda in the 17th century. In its purest form, it is single-masted, although ships with such rigging were built with as many as three masts, which are then referred to as schooners. Its original form had gaff rigging, but evolved to use what is now known as Bermuda rig, which had been used on smaller Bermudian boats since the early 17th Century, making it the basis of nearly all modern sailing yachts. Although the Bermuda sloop is often described as a development of the narrower-beamed Jamaica sloop, which dates from the 1670s, the high, raked masts and triangular sails of the Bermuda rig are rooted in a tradition of Bermudian boat design dating from the earliest decades of the 17th Century.