Bad luck with the ticket. I got caught by a camera van equipped with a laser system - now very common in the UK. We don't use radar any longer except on fixed camera sites and even they are beginning to go to induction loop systems in the road. We have 'Safety Partnerships' who operate vans equipped with cameras and if you break the limit you get your piccie taken and a letter in the post. Usual fine £60-00 plus 3 points. Get 12 points or more and you're off the road.

Having been caught three years ago I now use GPS based systems in our vehicles. Not sure if they're legal where you are, but they provide a useful backup to the speedo.

Having measured both of our bimmers with GPS speed indication systems the car speedos tend to indicate around 6-7% high at 70mph. 80mph indicated is approx 75mph GPS.

In the UK, speedos are not allowed to under-read and and must be within 10% +/- 2mph at 30mph.

Our E46 and E53 are both accurate to this tolerance over-reading 2mph at 30 mph indicated, and both give a GPS reading of 75mph for an indicated 80 on the speedo.

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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream