| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z | |
| A | |
| APPARENT WIND | The wind generated by movement in combination with True Wind. If a vessel is not moving, it will only be feeling the effects of true wind. In sailing, Apparent Wind is the actual flow of air acting upon a sail and is the wind as it appears to the sailor. |
| AWA | (Apparent Wind Angle) The wind angle measured relative to the bow of the vessel. |
| AWS | (Apparent Wind Speed) The measured speed of the wind compensated for the movement of the boat. |
| B | |
| BSP | (Boat Speed) The speed of the boat through the water. |
| BTW | (Bearing to Waypoint) The direction of travel towards a destination waypoint. |
| C | |
| CTS | (Course to Steer) The calculated course to a destination, compensating for drift. |
| D | |
| SET and DRIFT | Terms used to describe the effect currents have on your boat. SET is the direction in which the current is flowing. DRIFT is the speed of the current. |
| G | |
| GYBING / JIBING | Opposite of Tacking. This is when you are turning the boat away from the wind. Instead of the bow passing through the wind, the stern of the boat passes through the wind. Gybing / Jibing is generally performed when the sailboat is sailing downwind (wind is at the boats stern). |
| J | |
| GYBING / JIBING | Opposite of Tacking. This is when you are turning the boat away from the wind. Instead of the bow passing through the wind, the stern of the boat passes through the wind. Gybing / Jibing is generally performed when the sailboat is sailing downwind (wind is at the boats stern). |
| L | |
| LAYLINE | An imaginary line extending from the objective (typically a racing mark) to indicate the point at which a boat should tack or gybe / jibe in order to just clear the mark on the correct side (weather side if upwind [tacking], leeward side if downwind [gybing / jibing]). |
| M | |
| MARK | A point / waypoint that is designated as an turn on a route or a set position (waypoint) that your boat is intending to travel toward or round. |
| N | |
| NO-GO-ZONE | A sailboat cannot sail directly into the wind, nor on a course that is too close to the direction from which the wind is blowing. The range of directions into which a sailing craft cannot sail is called the 'no-go-zone'. |
| S | |
| SET and DRIFT | Terms used to describe the effect currents have on your boat. SET is the direction in which the current is flowing. DRIFT is the speed of the current. |
| T | |
| TACKING | Opposite of Gybing / Jibing. A sailing maneuver by which a vessel turns its bow into the wind, through the no-go-zone, changing from a starboard tack to a port tack (or vice versa). Tacking is performed when the sailboat is sailing toward a point of sail that is generally considered toward the wind. |
| TRUE WIND | The actual wind blowing. This is the wind felt when not moving. |
| TRU | (True Wind Angle) The angle of the wind, compensated by the forward speed of the vessel. |
| TWA | (True Wind Angle) The angle of the wind, relative to the boat if it were stationary. |
| TWD | (True Wind Direction) The true direction of the wind relative to north. |
| TWS | (True Wind Speed) The speed of the wind, if the boat were a stationary object. |
| V | |
| VMG | (Velocity Made Good) Indicates the speed of a sailboat towards (or from) the direction of the wind or an active waypoint. |
| W | |
| WAYPOINT VMG | A measurement of how fast a vessel is traveling, either toward or away from a waypoint. |
| WIND VMG | A measurement of how fast a vessel is moving, either toward the wind or away from where the wind is coming from. |