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Speed Readout from GPS

 
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hertz
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Joined: Apr 01, 2005
Posts: 9

PostPosted: Fri Apr 01, 2005 5:14 pm    Post subject: Speed Readout from GPS Reply with quote

Since installing TomTom Navigator 3 on my PPC and using it with a Fortuna Bluetooth GPS Receiver, I have noticed that in my Peugeot 306 the speedometer reading agrees exactly with the speed readout from TomTom. However, if I swap over to my LandRover Freelander, the speedometer reads 5mph faster than TomTom. Similarly, in a hired Nissan Micra, the speedo was also 5mph in advance of TomTom.

Am I correct to assume that the GPS readout is more likely to be accurate, and that the two vehicles reading higher have inaccurate speedos?

Hertz
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Oldboy
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Joined: Dec 08, 2004
Posts: 10643
Location: Suffolk, UK

PostPosted: Fri Apr 01, 2005 5:47 pm    Post subject: Reply with quote

Yes. It is quite normal to find that the speedo 'reads' faster than your true speed. The GPS unit will read correctly as long as you are travelling on a straight road, and not going up/down a hill.
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Richard

TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1135
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Hoppy
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Joined: Jun 16, 2004
Posts: 241
Location: Lincoln

PostPosted: Fri Apr 01, 2005 6:28 pm    Post subject: Reply with quote

In my Civic the speedo reads the same as the GPS upto about 35 mph after that my speedo reads between 5 and 7 mph faster than the GPS.
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Oldboy
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PostPosted: Fri Apr 01, 2005 7:57 pm    Post subject: Reply with quote

That seems about typical of our Civic. Manufacturers are allowed a tolerance of 0 to -10% true speed of the indicated. In theory you should never need to be breaking the speed limit?!!?
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Richard

TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1135
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Darren
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Joined: 11/07/2002 14:36:40
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Location: Hampshire, UK

PostPosted: Fri Apr 01, 2005 8:47 pm    Post subject: Reply with quote

The law states they must either be 100% accurate or up to 10% over hence manufacturer err on the side of caution.
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Darren Griffin
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