Quote:
Originally Posted by georgeyw
An in car speedo is inaccurate, as there are so many things that could cause discrepancies. ie tyre wear, tyre inflation, standard or non standard wheels/tyres used etc... Not sure about the states, but here the police tend to deduct a percentage from the speed you were 'caught' for to take into consideration erroneous speedo readings...
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I thought his readings were from the GPS Speedo hooked into the Navigation System, I guess I was wrong. I only use GPS for tracking speeds while racing boats. But in Marine racing GPS readings apposed to water pressure speedo have night, and day differences. So the application is much different then in a car, but still GPS is the most accurate way to determine your speed, and I thought that is what he was doing.