A hoy is a small sloop-rigged coasting ship or a heavy barge used for freight, usually with a burthen of about 60 tons (bm). The word derives from the Middle Dutch hoey. In 1495, one of the Paston Letters included the phrase, An hoye of Dorderycht (a hoy of Dordrecht), in such a way as to indicate that such contact was then no more than mildly unusual. The English term was first used on the Dutch Heude-ships that entered service with the Royal Navy.
Over time the hoy evolved in terms of its design and use. In the fifteenth century a hoy might be a small spritsail-rigged warship like a cromster. Like the earlier forms of the French chaloupe, it could be a heavy and unseaworthy harbour boat or a small coastal sailing vessel (latterly, the chaloupe was a pulling cutter – nowadays motorized). In the sixteenth century, Sir Roger Williams considered that a combination of manoeuvrability, shallow draught, and heavy artillery made the hoy the most effective warship in Dutch coastal waters. Hoys played a significant role in the Siege of Sluis (1587).
By the 18th and 19th Century hoys were sloop-rigged and the mainsail could be fitted with or without a boom. English hoys tended to be single-masted, whereas Dutch hoys had two masts. Principally, and more so latterly, the hoy was a passenger or cargo boat. For the English, a hoy was a ship working in the Thames Estuary and southern North Sea in the manner of the Thames sailing barge of the nineteenth and early twentieth centuries. In the Netherlands a slightly different vessel did the same sort of work in similar waters. Before the development of steam engines, the passage of boats in places like the Thames estuary and the estuaries of the Netherlands, required the skillful use of tides as much as of the wind.
Hoys also would carry cargo or passengers to the larger ships anchored in the Thames. The British East India Company used hoys as lighters for larger ships that could not travel up the Thames to London. These were commonly referred to as East India hoys.
In the eighteenth and early nineteenth centuries, English hoys plied a trade between London and the north Kent coast that enabled middle class Londoners to escape the city for the more rural air of Margate, for example. Others sailed between London and Southampton. These were known as Margate or Southampton hoys and one could hail them from the shore to pick up goods and passengers.
The introduction of the early steamers greatly expanded this sort of trade. At the same time, barges were taking over the cargo coasting trade on the short routes. Together, these developments meant that hoys fell out of use.