Supra ST Myster Posted February 4, 2007 Share Posted February 4, 2007 been meaning to ask this for a while, is there equipment that they use to measure your speed calibrated to the same as what your sat nav says your travelling at, just my work van is well out to my snooper aprox 8-10mph, like im doing 80 but snooper is showing 70mph, so i am safe to go by what sat nav/speed detectors show? Cus if i was in a 50 zone, and i go by the snooper but my van shows 58mph, i could in theory get done for being a few mph over? Link to comment Share on other sites More sharing options...
ivan Posted February 4, 2007 Share Posted February 4, 2007 SatNav is probably closer to your real speed than your speedo is. As long as it's got a good refresh rate anyway... Link to comment Share on other sites More sharing options...
hiten55 Posted February 4, 2007 Share Posted February 4, 2007 interesting, my road angel and my speedo are about 5 mph out.... anyone? Link to comment Share on other sites More sharing options...
SupraAyf Posted February 4, 2007 Share Posted February 4, 2007 The electronic systems that the Police use are calibrated to true speed. This means that your Speedo could say 34 when you are doing 30, therefore; you're not speeding. We used to use the Falcon-15 speed meter which had to be tuned every 3-months but it always recorded the true-speed of your vehicle. Link to comment Share on other sites More sharing options...
Kranz Posted February 4, 2007 Share Posted February 4, 2007 Speedos are allowed to be +10/-0%... So at 70 it can read as high as 77 or as low as 70. Fords with digital dashes over read by 7.5%. If you've fitted different wheel & tyre diameters (without getting the ECU reprogrammed) then this could be well out. Sat Nav will be pretty accurate. I'd go by that. Laser/Radar speed management devices are calibrated to within about 0.05% so they are the ultimate in speed measurement. Link to comment Share on other sites More sharing options...
edge Posted February 4, 2007 Share Posted February 4, 2007 When my sat nav is in my van it shows the speedo is nearly 5 mph out at 30 but gets worse at higher speeds. But my jeep has got bigger than standard wheels on and that is spot on til about 90 leptons. I always go by my speedo then i know im ok. Link to comment Share on other sites More sharing options...
Geo Posted February 4, 2007 Share Posted February 4, 2007 interesting, my road angel and my speedo are about 5 mph out.... anyone? Yea im the same mate. When reading 70mph or dash, road angel reads 64-65mph. So what one is right?? Link to comment Share on other sites More sharing options...
DaveK Posted February 4, 2007 Share Posted February 4, 2007 Road Angel / GPS is more accurate than speedo's. As are police lasers. Link to comment Share on other sites More sharing options...
juanchan Posted February 4, 2007 Share Posted February 4, 2007 Both my cars differ from Satnav by about the same amount. When the speedos read 80, Satnav reckons it's nearer 72-73. I've always gone with the Satnav figures as manufacturers tend to make speedos err on the conservative side. Link to comment Share on other sites More sharing options...
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