TomTom Go Classic Indicated Speed

Bloodaxe · Occasional Visitor Joined: Dec 17, 2004 Posts: 3

I apologise if this question has been asked before. Does anyone know how accurate the indicated speed is on the TomTom? The speedo on my car reads about 10% faster than that shown on the TomTom.

Antoeknee · Lifetime Member Joined: Jul 29, 2005 Posts: 267

Think you'll find its much the same for everyone (certainly is for me).

The speed from the TT is suppose to be more accurate. Apparently its not uncommon for speedos to over read.

dill · Regular Visitor Joined: Aug 05, 2005 Posts: 74

On a flat road they say it is more accurate than your car speedo.

Old_Phil · Posted: Wed Sep 28, 2005 3:09 pm Post subject:

Yes, this has been asked before - but some time ago now. The GO reading of speed is accurate - typically to within 1%. By law, car speedomoters must NOT over indicate - so if the TRUE speed of a car is exactly 70 mph, the speedo must not indicate less than 70MPH. Car manufacturers therefore set speedos to typically read 5%-10% higher than true speed. So, if your car speedo shows exactly 70 MPH you will in fact be driving at typically 67 MPH - you will certainly NOT be exceeding 70 MPH.

I always watch my GO speed and ignore the speedo reading. I use my GO to set my cruise control so that I don't exceed speed limits where radar is in operation.
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d33mb33 · Occasional Visitor Joined: Jan 27, 2005 Posts: 11

My wife has a 406 which overreads about 2%.
I have an Alfa Romeo which overreads about 10%.

So it varys from manufacturer to manufacturer.

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