Sat Nav speed accuracy

actualy using your post as an example keats I would have to say that it is actualy more dangerous to have the inacuracy in the speedo since thre are actualy a large protion of those people that are braking for a camera that are not really over the speed limit but thier speedo is telling them that they are.

And it's even worse here since the speed limits are higher and they are allowed to hide cameras here, in rubbish bins or behind bushes and such, which they are not allowed to do in the UK. (unless the law has changed but when I lived there they had to be visible at a distance and at night which is why they all have yellow reflective stuff on them.)
 
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Larkspeed said:
And it's even worse here since the speed limits are higher and they are allowed to hide cameras here, in rubbish bins or behind bushes and such, which they are not allowed to do in the UK. (unless the law has changed but when I lived there they had to be visible at a distance and at night which is why they all have yellow reflective stuff on them.)
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Yup, they are still usually very visible. I'm in Switzerland at the moment and it's like NL here - they are grey/camouflaged and hidden as best as possible. I've been warned by colleagues of a couple that are literally invisible until you are right on top of them.
 
lol totaly off topic but funny none the less me and my wife actualy managed to get 4 speeding tickets in 1 day all in the same spot.

It was on the road into town, the speed limit there is 50 kmh but there is nothing on that road at all so people are always doing around 70 kmh along it.

They clocked me taking our son to school in the morning and coming back.

They then clocked my wife going in to pick him up and then also coming back.

We actualy requested to photo's because we could not believe niether of us saw the camera.

From the photo's we figured out they actualy put the camera in a bush on the side of the road by a flyover totaly invisible from the road. The accompanying police car then parked on the road under the flyover also invisible from the road being clocked and plugged into the camera with a long cable.

Over 300 euro in speeding tickets in 1 day
 
Interesting to note, the dashboard module in my Rover 75 has a deep (and difficult) menu, in which one of the options is Speedometer adjust (in hex =\) which allows you to fiddle with exactly this (it is meant for when the needles are removed, but ho hum) - As far as I am aware, the dash computer in a 75 is from a 3 Series (Menu is the same on the equiv three series) So I would expect current BMWs also have such a feature?
 
I would certainly trust a SatNav to give a pretty accurate reading of speed. I have checked the speedo on three different cars using any of of three SatNavs and three GPS units. The SatNavs and the GPS units pretty much agree with one another but all indicate that the speedometers exaggerate.

The discrepancy varies from 7% to 4% - never by 10% in my experience although I believe that legislation says that a 10% tolerance is permissible and that this +2 mph is assumed in the ACPO Speed Enforcement Guidelines - e.g 35 mph in a 30 mph limit area and 79 mph in a 70 mph limit area.

Your mileage may vary ;)
 
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