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      08-18-2016, 01:22 AM   #3
pruettfan
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GPS systems in the USA have built in errors, this is because the Department of Defense back when civilians first got widespread access to GPS were paranoid GPS would be used for bad purposes. Modern day systems are very accurate but I believe there is a 15 or 16 foot error built in if I recall properly. Also european speedometers have built in errors to ensure they read higher than actual speed. Car magazines report on this regularly, I believe the speedometer is something like 3% off. Point is neither system is designed to be perfect so I am not surprised they don't match exactly. Its an interesting discovery but certainly nothing to worry about.
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