In sailing, current refers to the horizontal, continuous movement of water, defined by its speed (often in knots) and direction. Caused by tides or river flow, it affects a vessel’s speed over ground and steering, causing "drift" or "leeway" (sideways movement). It differs from waves and wind, acting as a force that moves the boat regardless of its own power.

Key Aspects of Current in Sailing:
Measurement: Current speed is measured in knots, where 1 knot equals 1 nautical mile per hour.

Impact on Steering: When the current flows in the same direction as the boat, it increases speed (favorable); opposite to the boat, it reduces speed.

Identifying Current: Sailors identify current by observing fixed objects like channel markers, mooring buoys, or by tossing floating objects into the water.

Eddies: Areas of water circulating in reverse, often found behind obstacles or along the edge of the main current flow.