Abbreviations


Sailing Instruments

AbbreviationTechnical nameDescription
AWAApparent Wind AngleWind angle as seen onboard the boat
AWSApparent Wind SpeedWind speed as seen onboard the boat
TWATrue Wind AngleWind angle compensated for the movement of the boat
TWSTrue Wind SpeedWind speed compensated for the movement of the boat
TWDTrue Wind DirectionThe magnetic orientation of the wind over ground
GWDGround Wind DirectionThe magnetic orientation of the wind (Same as TWD)
BSBoat SpeedSpeed of the hull through the water
VSVelocity (Speed)Speed of the hull through the water (Same as BS)
SOGSpeed Over GroundSpeed from the GPS sensor
HDGHeadingMagnetic orientation of the bow.
COGCourse Over GroundGPS direction the boat is moving
VMGVelocity Made GoodHow fast the is boat moving towards (or away) the direction of the wind.
CMGCourse Made GoodHow fast the boat is moving towards the waypoint.
DTGDistance To GoDistance to next waypoint
DTMDistance To MarkDistance to next mark (Same as DTG)
TTGTime To GoTime to reach next waypoint
TTMTime To MarkTime to reach next mark (Same as TTG)