How frequently do you lot have accidents that you are gearing up for them full time?
My worry would be that the evidence thing works both ways - the camera is evidence of speeding for plod to use. So a brake lights fails, you get pulled over and plod says " we'll have a look through that" " Aha- 55 in a 50 limit!"
Don't have GPS on mine.
But, when I was run into from behind last February, footage proved that I was stationary when hit. I offered it to my insurance company when the offending party's insurance weren't going to pay up. Just the fact that I had footage changed their minds...