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OneSky's GPS Forecast App provides a 1-hr forecast of available GPS/GNSS satellites and horizontal position accuracy (HDOP) at your flight's location.
Simply click the OneSky GPS App from any flight plan to reveal both the number of available satellites and the associated horizontal position accuracy expected at that flight location over the next hour.
Horizontal Dilution of Precision (HDOP) values are used to represent the positional accuracy of a GPS/GNSS solution. In general, values above 2.0 are representative of poor accuracy and should be avoided for surveys or flight plans requiring autonomous flight precision.