Its normal for you to be off by a few meters since you are moving after all, and these are cheap consumer-grade receivers. Satellite signal availability may also be an issue. There is an area near my house where my Garmins (I have several) loose satellite lock for for a few minutes while I pass by.
Although this being in China, the conspiracy theorist in me thinks that the US is turning on Selective Availability (SA) again hehe.




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hahahahaha but road signs are indication 120kph.











