Abbreviations


Sailing Instruments

Abbreviation Technical name Description
AWA Apparent Wind Angle Wind angle as seen onboard the boat
AWS Apparent Wind Speed Wind speed as seen onboard the boat
TWA True Wind Angle Wind angle compensated for the movement of the boat
TWS True Wind Speed Wind speed compensated for the movement of the boat
TWD True Wind Direction The magnetic orientation of the wind over ground
GWD Ground Wind Direction The magnetic orientation of the wind (Same as TWD)
BS Boat Speed Speed of the hull through the water
VS Velocity (Speed) Speed of the hull through the water (Same as BS)
SOG Speed Over Ground Speed from the GPS sensor
HDG Heading Magnetic orientation of the bow.
COG Course Over Ground GPS direction the boat is moving
VMG Velocity Made Good How fast the is boat moving towards (or away) the direction of the wind.
CMG Course Made Good How fast the boat is moving towards the waypoint.
DTG Distance To Go Distance to next waypoint
DTM Distance To Mark Distance to next mark (Same as DTG)
TTG Time To Go Time to reach next waypoint
TTM Time To Mark Time to reach next mark (Same as TTG)