Good Gravy!!! There is no way you can beat a speeding ticket with your GPS!! Just pay it. You could still argue the point, but they won't recognise your device against a Radar or Laser certified Police officer. I could see if you live in a really small town and you have a Barney Fife type cop that doesn't know how to calibrate his speed detection device. Again you would have to prove the officer didn't use it correctly. From an ex-Cop.