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So everyone uses GPS to verify speedometer readings.
Any GPS I have ever used has an error factor when showing exact location.
They can get you within say 15 feet of a specific spot or 20 feet or what ever the error factor is at that particular time and location.
So are they spot on accurate when it comes to speed??????
If I wanted to verify my speedo I would use a measured distance over time.
I would think that would be the most accurate.
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