Sailing against the wind defies common sense. The challenge is to find the best balance between speed and angle against the wind to maximise your Velocity made good (VMG).
Rules / Notice of Race
To get a valid track it needs to be recorded in the GPX format with at least one sample every 2 seconds (0.5hz). Your track has to consist of 4 consecutive tacks with 2 to 6 minute long upwind legs between the tacks. Course and speed are calculated as average between the tacks.