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Originally Posted by entwisi
You will find that 75mph indicated on a car speedo is an actual 70 or sometimes less. My GPS shows my cars speedo at 76 for an actual 70, 84 = actual 77 (speed limit +10% which is the actual speed coppers will start to look at issueing a ticket)
Some cars are even further out.
So sitting at an indicated 75 busman will probably not have been speeding.
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I totaly agree with entwisi on this as i use GPS. I'v had the GPS unit in numerous cars of my own,Roys (seeing that it belongs to him
) and company cars. Everytime it shows 5mph error at 70 mph. when i have it in the car i totaly ignore what it says on the spedo and read the GPS, that includes going through speed traps, contraflows and passing police cars. The GPS is usually picking up between 5 and 8 satelites and has no or little chance of error, where as your car spedo has! Worn tyres as an example, if your traveling at 70 mph one day on worn tyres and the next on new ones, how can it possibly be the same speed?????