GPS Information Service » how acurate is the MPH reeading of a car GPS unit? http://www.gpsinformationservice.com Information on GPS navigation and other GPS applications Thu, 02 Feb 2012 20:03:07 +0000 en hourly 1 http://wordpress.org/?v=3.3 how acurate is the MPH reeading of a car GPS unit? http://www.gpsinformationservice.com/car-gps/how-acurate-is-the-mph-reeading-of-a-car-gps-unit http://www.gpsinformationservice.com/car-gps/how-acurate-is-the-mph-reeading-of-a-car-gps-unit#comments Wed, 24 Jun 2009 23:26:18 +0000 admin http://www.gpsinformationservice.com/car-gps/how-acurate-is-the-mph-reeading-of-a-car-gps-unit There is about a 3 mph difference between my auto speedometer, and my GPS unit. How accurate is the GPS unit

3 mph hour difference is with in normal limits. Neither the car or the gps is 100%. Car can be affect by tire wear and size of tires. Even gear wear can change it. With the gps there is lag time to the satellite. Only the military gps are pin point accurate

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