ghost

To ghost is to move a sailing vessel through the water when wind conditions are so light that normal sailing should be impossible. The boat maintains steerage and forward motion despite wind speeds that typically fall below 2 knots, sometimes in conditions so calm that the water surface appears nearly flat. This happens most often in the early morning, at sunset, or in the doldrums between weather systems.

The mechanics rely on hull design and sail trim working in concert. A light-displacement hull with minimal wetted surface and a smooth bottom finish will ghost more readily than a heavy cruiser. The sails must be set with extreme precision, angled to catch whatever air moves, however faintly. Even small sails like a jib or staysail may be deployed instead of the main to reduce drag. Crew weight distribution matters: too many bodies on deck adds wetted surface and slows the boat further.

Ghosting is both a skill and a test of boat design. Racing yachts designed for light-air performance excel at it, while traditional fishing boats or working vessels often cannot. The phenomenon also exposes hull cleanliness: a fouled bottom or accumulated weed will stop ghosting entirely. On long passages, the ability to ghost forward in calm conditions rather than lying becalmed can mean the difference between making progress and losing hours or days.

The term draws on the image of the vessel appearing to move as if propelled by something unseen or immaterial. Sailors have used it for centuries. In modern sailing, ghosting has taken on competitive importance: light-air tactics separate skilled helmspeople from average ones, and boat-handling technique becomes more visible when the wind itself is invisible.