Re: Speedometer Accuracy vs. GPS - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Speedometer Accuracy vs. GPS
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Posted by upsidedown (more from upsidedown) on Sat, 20 Jan 2007 06:26:33 Share Post by Email
In Reply to: Speedometer Accuracy vs. GPS, Boston Baab, Fri, 19 Jan 2007 17:57:06
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I would trust the GPS. If you drive at a steady state, depending on the GPS, the spped of the processor, the number of satellites, etc. It should lock in and provide a very accurate representation of your speed. If you stop, the GPS may still show forward movement until it 'catches up'.

I have a portable GPS in my Saab 9-5, and the GPS shows about 3 mph faster than the speedometer. I also travel a lot and rent cars, and in some cars it is a dead match, and others it is off by less than 1 mph. So I would agree with DEAN that the speedo is not accurate to your exact speed.

BTW, the GPS I am using is the MIO c310x which many stores have been using as a cheap special. Pretty good considering the price.

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