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Decided today to calibrate the ScanGauge against my GPS, regarding mph. I have two GPS speed indicators in the vehicle. My TomTom One Sat Nav and on the rear of my Nextbase 512G dash cam. I was very pleasantly surprised to see that all three recorded exactly the same speed, up to 60 mph (fastest I checked), and that the ScanGauge was the fastest to update. That should mean that its distance measurement skills are spot on as well.
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