I work in the GPS industry. We sell high-end GPS tracking and messaging system to the oil and gas industry. I have heard from many clients that they were able to use our active GPS 'map trace' function (and supporting minute-by-minute reports) to have speeding tickets outright dismissed in court. I have ask for some more details in light of this thread. I will post the steps they took in their defence (while maintaining confidentiality, of course), but I would assume their logic to be similar to David's with the main exception being that they actually had real-time GPS evidence to present.
In other news, I was called by my insurance company (Aviva - brokered by Competition Insurance) and I was offered a 30% reduction in my 2009 premiums because I have just installed an active GPS system into my cat. Once I'm able to hit the road again, I will send links to the GPS data that I pull from our software. I am wondering if I'll be able to peak the GPS speed-o over the 300 km/h mark ... if only for a minute.
