Sat Nav V's speedometer

joe-rogers · Posted: Tue Nov 21, 2006 12:24 pm Post subject: Sat Nav V's speedometer

The speed I'm travelling shown on my Sat Nav (TomTom GO 500) is slower than my speedo. Can anyone tell me which is more accurate please?

Joe Laughing

PaulB2005 · Posted: Tue Nov 21, 2006 1:58 pm Post subject:

Sat Nav - all speedo deliberately read higher than your actual speed to avoid problems with speed limits and the law. If they tried to be accurate you might be able to sue the manufacturer because their error allowed you to break the speed limit.

missing_user · Joined: Aug 30, 2008 Posts: -7

Sat-Nav
Three different GPS units show my car [with the speedo reading of 80mph] at a speed of 72mph.

joe-rogers · Posted: Tue Nov 21, 2006 2:19 pm Post subject:

Ah rite, so I guess my speeding fine is going to stand Crying or Very sad

paulyoung666 · Occasional Visitor Joined: May 30, 2006 Posts: 47

looks like it , what are you getting done for ????

MaFt · Posted: Tue Nov 28, 2006 12:44 pm Post subject:

Robin2 · Posted: Wed Nov 29, 2006 1:11 am Post subject:

EU regulations mean that all cars sold in Europe must have speedos that read between 0 and 10% fast. The GPS speed is accurate to better than 1 mph, but only if you are travelling at a steady speed, on level ground and in a straight line.
My own car (a VW) reads 73 mph when the GPS indicates 70. In my experience, most Fords are close to 10% fast. (Your car speedo will vary a little according to the tread depth of your tyres.)
Strumble's 80 mph speedo reading with a GPS speed of 72 seems just outside the permitted limits - but only by the thickness of the needle!
Robin
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