Glossary / Abbreviations
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COG
Course over groundThe true direction of progress of a vessel between two points with respect to the surface of the earth. The vessels COG may differ from its heading due to effects of wind, tide and currents.
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Course
The latest direction of movement, using the seabed as a reference.
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DOG
Distance over groundDistance over the ground, measured point to point, in nautical miles.
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DTF
Distance to finishThe distance (in nautical miles) from the boat to the finish line (passing any gates or land that might be in the way) at the time of the position report, measured along the great circle route.
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DTL
Distance to leadThe number of nautical miles closer to the finish that the yacht needs to be to overtake the leader - in other words, the yacht's current Distance To Finish subtracted from the leader's (the leading boat still racing) Distance To Finish.
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ETA
Estimated time of arrivalAn estimate (using the available information about the yacht's performance and the anticipated weather provided by Great Circle) of the time the yacht will reach the finish - when the yacht has finished, this will be the actual arrival time.
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Gain/Loss
The change in the Distance to Lead since the last position report - a positive number means that the yacht has gained miles on the leader, and a negative number means the leader has moved further ahead.
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HOUR UTC
Time UTC at positionUTC Timestamp of when the data was issued in the Position Report.
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SOG
Speed over groundThe true speed of progress of a vessel between two points with respect to the surface of the earth. The vessels SOG may differ from its speed due to effects of wind, tide and currents.
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Speed
Speed coming from the last position report, measured at that moment.
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Status
RAC=Racing; SUS=Suspended racing; STM=Stealth mode; FIN=Finished;
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TWA
True wind angleLast measurement of the angle of the boat to the wind
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TWD
True wind directionThe wind direction for a stationary observer
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TWS
True wind speedThe wind speed for a stationary observer
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VMG
Velocity made goodSpeed towards the next waypoint averaged over the last course
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