heave to

Heave is from Old English hebban, meaning 'to lift' or 'to pull with effort.' To heave to is to set a vessel's sails in opposition — the headsail backed against the mainsail — so the forces cancel out and the boat drifts slowly, nearly stopped, without an anchor. The technique has been known since at least the 1500s and was a standard maneuver in every sailing navy.

The maneuver was critical in heavy weather. When a storm overwhelmed a vessel's ability to sail safely, the crew would heave to and wait. The backed headsail and counteracting rudder created a stable angle to the waves, reducing the chance of capsizing. Ships have survived hurricanes hove to. Sir Francis Drake hove to during a Pacific storm in 1578 and lost only one vessel from his fleet, the Marigold, which tried to keep sailing.

Heaving to also served peaceful purposes. When two vessels met at sea to exchange mail, cargo, or officers, both would heave to alongside each other. Whalers hove to beside their prey to process the catch. Men-of-war hove to before sending boarding parties. The maneuver was the ocean equivalent of pulling over — a way to create stillness in a medium that never stops moving.

Modern sailors still heave to. Single-handed ocean racers use the technique to sleep safely during multi-day passages. Cruising sailors heave to for lunch, for repairs, or simply to rest. The physics have not changed: opposing sail forces plus rudder correction equals near-stasis. It is one of the oldest active techniques in sailing, and no technology has improved on it because none needs to.