While driving down the A4174 highway near Bristol, on November 28th 2008, Gareth Powell was clocked going 61 mph in a 50 mph zone by a police officer with a speed gun. The police officer wrote him out a ticket that Powell was positive he didn’t deserve.
He said: “I’m an extremely careful driver and I was certain I hadn’t broken the law.”
At the time, Gareth had a GPS navigation system in his car that was not only tracking him but could also tell how fast he was going. After contacting Navman Wireless (his GPS device’s manufacturer) and getting the records of how fast he was going at the time, he was able to provide proof that he really was within the speed limit. It turns out that Powell had been moving at 48 mph. In court he managed to have the director of Navman Wireless IT, Barry Neill, serve as an expert witness to back him up:
“The GPS fix on Gareth’s vehicle from the tracking system was excellent when he was clocked by the speed gun… The eight satellites locating his vehicle were advantageously positioned. Under good conditions, GPS tracking technology is accurate to within three meters.”
Thanks to the GPS navigation system in Powell’s car, he was not just able to beat a speeding ticket, but he also managed to prove that GPS devices can be more accurate then the speed guns used by the police officers.