daz Posted June 7, 2008 Share Posted June 7, 2008 my tom tom mph only goes up too 150 mph how true are these sat navs . it was test see how far my clocks was out vs tom tom Link to comment Share on other sites More sharing options...
Gaz Walker Posted June 7, 2008 Share Posted June 7, 2008 I take it this was on a track? Link to comment Share on other sites More sharing options...
MrRalphMan Posted June 7, 2008 Share Posted June 7, 2008 At a steady speed any GPS driven speed display 'should' be within 1mph of true speed. There are a number of factors though that could affect accuracy. Signal Strength View of Sky - goes with above If you are not staying at a steady speed. Link to comment Share on other sites More sharing options...
Scott Posted June 7, 2008 Share Posted June 7, 2008 They are pretty much spot on. Your speedo will be MILES out at those kind of speeds though. Mine is out by 5mph at 70, its a safety thing built in deliberately. Link to comment Share on other sites More sharing options...
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