Glossary

Active Track	An active track is displayed in the track player and in the tables.
Current Position	The track player displays a boat avatar at the current position. When a track is first loaded, the current position is the first point in the track. As you navigate using the Navigation buttons, the current position moves.
Current Track	When multiple tracks are displayed, one of the tracks is the current track. The navigation buttons drive the current track, and all other tracks follow to stay in sync. See Working with Multiple Tracks for more information.
Bearing	The boat's heading, or angle in degrees that the boat is traveling.
Deviation	The angle between the boat's heading and the direct line from the previous mark to the next mark. Deviation is measured separately for both port and starboard tack.
Event	A yacht race or other happening for which tracks are simultaneously recorded.
Latitude and Longitude	Coordinates representing a position on the surface of the earth. Latitude indicates the distance from the equator (think North-South). Longitude represents the distance around the earth from Greenwich, England (think East-West).
Leg	A segment of a course between two marks
Mark	A mark of the course. Legs boundaries are computed from the nearest track point to each mark.
Rhumb Line	An imaginary line straight line from the previous mark to the next mark. TackTracker draws the rhumb line as a faint grey line.
Speed	The speed measured by dividing the distance from the previous track point to the following track point by the elapsed time.
Tack	A sustained change in direction.
Track	A sequence of logged track points. Each track point records the latitude and longitude coordinates and time.
Track Library	The Track Library shows events and tracks stored by TackTracker under My Documents\My Tracks.
TTX	A TackTracker saved event file, including all participating tracks. Use to send an event to another TackTracker user.
VMG	Velocity Made Good VMG is the speed relative to the Rhumb line. On the run or reach, you may sail faster if you do not sail directly towards the next mark. Compare VMG to compare the effective speed of boats sailing directly towards a mark and those sailing at the optimum sailing angle. TackTracker also calculates VMG relative to the current Wind direction. This is useful when the Rhumb line is not available (as when training) or when the course is not true.