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bwg Occasional Visitor
Joined: Sep 22, 2006 Posts: 18
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Posted: Fri Oct 06, 2006 1:12 am Post subject: Speed accuracy |
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Curious to know how accurate the speed indication is on the sat navs. I have Tomtom One v2 and if it is accurate then my car speedo under reads by 2mph at 30 and 4 mph at 70 which means I can go a bit faster and still be within the speed limit. |
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mrralphman Occasional Visitor
Joined: Dec 27, 2005 Posts: 34
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Posted: Fri Oct 06, 2006 1:20 am Post subject: |
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I think that a decent SatNav setup should be within 1MPH of true speed.
My car's speedo is 11% out, so when I'm doing a true 30MPH, my indicated speed is 35.
This difference gets greater the faster I go.
An Indicated 140 is only about 125 MPH |
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peterc10 Frequent Visitor
Joined: Aug 21, 2005 Posts: 1761 Location: Kent, England
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Posted: Fri Oct 06, 2006 3:07 pm Post subject: |
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If you are travelling on a reasonably straight and level road and at a constant speed the sat nav is accurate to 0.1mph. Hills make a difference (because only the horizontal distance you travelled is computed, not your actual distance) and it is a little behind with the reading of your speed.
Speedos are allowed to read up to 10% higher than real speed, but they are not allowed to read lower. _________________ Peter
HTC Sensation
Sygic GPS for Europe (No more TT "support"!)
Copilot for USA
Bury CC9060 bluetooth car kit & Brodit mount |
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Skippy Pocket GPS Verifier
Joined: 24/06/2003 00:22:12 Posts: 2946 Location: Escaped to the Antipodies! 36.83°S 174.75°E
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Posted: Fri Oct 06, 2006 10:06 pm Post subject: |
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There was a long discussion about this here
mrralphman wrote: | An Indicated 140 is only about 125 MPH |
On a private test track of course. _________________ Gone fishing! |
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mrralphman Occasional Visitor
Joined: Dec 27, 2005 Posts: 34
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Posted: Sat Oct 07, 2006 5:37 pm Post subject: |
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Of course...
*** Cough Cough *** 8) |
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