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I don't know how a "calibrated" speedo would get you out of/excused from a speeding ticket- it's main function is to KEEP you from getting caught in the first place.
I had it calibrated AFTER I got the ticket. The cop said I was doing 75 when the speedo said 65, so after I got it fixed, the judge let me out of it.
The problem with relying on GPS as your speedo is it is a lagging indicator depending on how fast your GPS updates your positions. Most low end GPS systems update about once every 45 to 60 seconds.
Tell me about it... He actually suggested it too... when I went in the first time and I told him I honestly thought I was doing 65, he told me I had a month to get it calibrated and he'd excuse me.