Two stage accelerator pedal?

[Anonymous]

which leads me to another question. there always seems to be a discrepancy between the electronic speed readout and the one on the normal speedo. the normal speedo seems to be about 3 or 4 mph faster than the electronic one..... is this normal? which one is right? or is this just the normal difference between a sat nav speedo and a "normal" one?

tia

Yep there is a difference - Cruises, speedo and statnav (mines a TomTom standalone) - I always go off the TomTom as it's using the satellites.

Rob

Then you are ultimately going to get yourself nicked...... GPS speed is averaged and dependant on a whole load of errors that I have tried to explain previously. Your car speedo is consistent, satellite is not.
:thumbup:

Yes we have been through this before. If you're accelerating or decelerating - use your speedo, but as long as you're maintaining a constant speed, your GPS speed will be very accurate to less that 1 mph. While there are error factors relating to GPS position, GPS speed uses Doppler shift which provides far more accuracy for speed measurements. As a result of having performed plenty of reference speed measurements with the Australian police in the past, I, like RCZMK, use GPS speed to set my cruise control and have been for many years. I've passed many hundreds of manned speed traps and speed cameras in that time and I have never been stopped for speeding. In Australia the standard for speedo accuracy is +/- 10% but in almost all cases the speedo reads high, so if you drive to your speedo, your actual speed is lower than your Speedo displays. At 100kph on my GPS my speedo reads 104kph and both maintain their steady readings without deviation.