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Pocket GPS World :: View topic - Sat Nav v Car speedo
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Sat Nav v Car speedo

 
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fthompson
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Joined: Oct 16, 2010
Posts: 3

PostPosted: Fri Jul 10, 2015 3:47 pm    Post subject: Sat Nav v Car speedo Reply with quote

can anybody advise re the difference between speeds shown on Sat Nav Nd Car speedo
Sat Nav always indicates a slower speed than the speed shown on the car speedo which is correct
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Kremmen
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Joined: Mar 03, 2006
Posts: 6707
Location: West London & Reading

PostPosted: Fri Jul 10, 2015 4:39 pm    Post subject: Reply with quote

A long known phenomenon. For quite a while now, at least since 2006, manufacturers have been doing this by as much as 7%. This is more noticeable on modern digital speedos.

The SatNav will be the more accurate but if you're like me I use the car speedo going through cameras and specs zones.
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M8TJT
The Other Tired Old Man
The Other Tired Old Man


Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK

PostPosted: Fri Jul 10, 2015 6:12 pm    Post subject: Reply with quote

The car speedo must not read slower (under read) than you are actually going. So to allow for tyre wear etc. (speedo will read faster as tyres wear), they are deliberately set to over read on new tyres by about 5 to 10%.
The speed on your sat nav is much more accurate for your actual speed.
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