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classy56
Frequent Visitor
Joined: Sep 08, 2006
Posts: 441
Location: Dorset
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 Posted: Wed Feb 11, 2009 9:24 am Post subject: |
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| navver wrote: | The odometer is out by a similar amount as my speedometer in my 406.
Before I got a satnav I tried an autoroute route and followed the trip odometer readings to prompt me for each turn. By the time I got to London (100miles) I was several miles adrift.
The fuel consumption on the trip computer is also out by a similar amount compared with brimming the tank & working it out from the odometer. |
I would suggest that it was Autoroute that was adrift rather than your odometer, I never trust autoroute for distances, because I know for a fact they are more often than not wrong.
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Tomtom Go730T
App 8.300
Map v815.2003
To old to die young. |
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Robin2
Lifetime Member
Joined: Nov 24, 2003
Posts: 1441
Location: Swansea
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| Posted: Wed Feb 11, 2009 6:29 pm Post subject: |
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And don't forget that as the tread depth on your tyres wears from 7mm to 2mm, your speedometer/odometer accuracy changes by a further 2.5% approx
Robin
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TomTom One v3 Europe, Navcore 7.903, Western Europe 835.2420
TomTom Go 720 Europe, Navcore 8.351, Western Europe 855.2884
Satmap Active 10
Plus a lot of other PDA GPS kit, seldom used |
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Brad99
Occasional Visitor
Joined: Apr 12, 2008
Posts: 11
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| Posted: Wed Feb 11, 2009 7:40 pm Post subject: |
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| My TT530 reads slower than the speedo in my Nissan, by 2-3mph at 30-40mph and 4mph at 70-80mph indicated. I have had the accuracy of my speedo checked against 1/10km motorway red/blue posts with a stopwatch and a few calculations; this puts the more accurate readings definitely with the TT. |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Wed Feb 11, 2009 9:31 pm Post subject: |
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From the Sirf Star lll specifications at www.sirf.com/products/GSC3LPProductInsert.pdf
Velocity Accuracy
Speed<0.01 m/ s
Heading <0.01°
Position Accuracy
< 10 M at 2D RMS.
60mph =26.8m/sec (approx) and .01m/sec as a percentage of 26.8 = about 0.04%. There you go. Is your speedo more accurate than this??  No competition I suspect |
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