Started by JimG, February 07, 2018, 19:15:44 pm
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Quote from: JimG on February 07, 2018, 19:15:44 pm. The main fault I found was the GPS coordinates recorded. I was able to convert these to a suitable format and imported them into Google Earth. According to them the plane was flying around 20 miles to the south east from the flying site and was around 5 to 10 miles from land over the North Sea. Surely the GPS cannot be that inaccurate or is the Tx reading the telemetry wrongly?Jim
Quote from: dart16 on February 08, 2018, 12:07:47 pmSounds like you have two different datums being used here. Google earth uses WGS84 what datum does your GPS use and how did you 'convert' the readings?
Quote from: JimG on February 08, 2018, 19:47:56 pmThe log readings are of the format 246.1868W 5629.0413NUsing Excel I first removed the trailing letters to give a straight number then divided them by 100 to give decimal degrees 2.461868 and 56.290431. The longitude was then made negative -2.461868 to fit being west of the zero longitude.Actual values for our field from Google Earth are -2.770412 and 56.484366.As far as datum surely it would use the same zero points as standard.Jim
Quote from: JimG on February 08, 2018, 19:47:56 pmThe log readings are of the format 246.1868W 5629.0413N
Quote from: Steve J on February 09, 2018, 23:17:42 pmThe format is probably NMEA GGA, so that is 2°46.1868' W 56°29.0413' N which appears to be the side of a track next to a flying club.Steve
Quote from: JimG on February 10, 2018, 11:19:43 amOnly around 80 meters off so an acceptable accuracy.
Quote from: Steve J on February 09, 2018, 23:17:42 pmThe format is probably NMEA GGA, so that is 2°46.1868' W 56°29.0413' N
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