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So far extremely erratic as a speedometer which I why I decided to buy it as one of my cars has a speedo that is about 10% fast (according to my GPS and stationary government radar speedos (the kind one finds near construction sites and school zones).

At o/a 25 mph the V-Cockpit GPS speeds moved erratically from zero to over 100 mph! At 55 mph they ranged about 10 mph high and low.

omgvua about V-Cockpit GPS