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Squibby Lifetime Member
Joined: Mar 22, 2004 Posts: 5
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Posted: Fri May 20, 2005 10:06 pm Post subject: Accuracy of speed |
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Has anyone checked how accurate the speed indicator is on TomTom. I've tried the unit in several cars and in each case the Navigator suggests I'm going 4/5 mph slower than the car's speedometer.
Any idea which is likely to be reliable? |
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lbendlin Pocket GPS Staff
Joined: 02/11/2002 22:41:59 Posts: 11878 Location: Massachusetts, USA
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Posted: Sat May 21, 2005 12:47 am Post subject: |
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TomTom is right, your speedometer is wrong. Please search the forums - there are a lot of threads aroudn that. _________________ Lutz
Report Map Errors here:
TomTom/TeleAtlas NAVTEQ |
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sn0rg Occasional Visitor
Joined: Aug 22, 2004 Posts: 25
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Posted: Sun Jun 19, 2005 9:36 pm Post subject: |
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lbendlin is right. A car speedo is/can be affected by various factors such as wheel size, tyre profile, tyre pressure, gearing etc. GPS is accurate, without exception. |
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Gadjet Regular Visitor
Joined: 26/09/2002 08:03:29 Posts: 75 Location: United Kingdom
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Posted: Mon Jun 27, 2005 1:17 pm Post subject: |
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The main thing here is that when a speedometer is designed and calibrated it has to meet legal requirements that says it has to read upto 10% higher than actual speed, above 30mph.
This allows for other things like tyre wear, etc without reading less than your actual road speed.
Gadjet _________________ www.gadjetsblog.blogspot.com |
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