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I have now looked at the CSV file from a track and I can see that there’s no value for wind direction so it must be calculated (as I found from the post on LinkdIn). Would it be possible to add two values for wind direction and wind strength and use this data on import. Then you could include some logic in the program so that if no data is present in the wind fields, your algorithm is used to calculate wind direction. If you decide to support NMEA data inputs in future, which give accurate onboard data, you can then store the information in the CSV file in the same location. The wind data may also help with big wind direction changes (as we often get in Australia) where the wind can change from 10 knots in one direction to 25 knots from 180 degree different direction in less than 30 mins.