Not talking mountainous regions, but it's a known fact that GPS speed is more accurate than a speedo, I even googled it beifr ei posted to make sure I was correct sill 
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Regards, Bashy
MY07 (56 plate) V70 Geartronic 2.4 D5 185bhp 173k, 17", full leather, an auto-dimming mirror and auto wipers are the best it can do - I have added (poorly) limo black, rear camera and parking sensors
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