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Sat nav is not very good at working out speed if you are on an incline/hill ....it has to do with 3d nav - and they are getting better, but are not that good. So *never* trust a sat nav reading. In basic terms if you go up a steep hill - some sat navs work out your speed on distance travelled - i.e. for example say 1/2 a mile, but you've also gone UP as well .. ans it doesn't know. Simple trig....
The satnav is mot as accurate as that, but more accurate than the standard speedo. Mind you, the sat nav doesn't like high speeds. I had to go on a blue light run down the motorway a few days that involved high speeds. The satnav got confused as it couldn't keep up. Poor thing! :D
Who aggrees with me that if this goverment pays more attention to reducing the speed down to 70 mph in cars by fitting a speed limiter.
I did wonder when the spike comment would pop up.Oh well.