Speed on speedo or road pilot, witch is most accurate??

[M7CUO_V6]

I have just installed my 'Road Pilot' in in my car. The speed on the speedo is abot 4-5% higher than that on the RP. I thought these gps speed camera detectors where ment to be spot on?

If they are, then the dc5's speedo is out a fair bit (more than in my last to clios).

Any one else notice this in their cars??

 

[spirez]

GPS is much more accurate. I've yet to see a car which doesn't read higher on the speedo

 

[Alan]

Yep GPS is pretty much exact matey..

 

[wozzaa]

GPS is much more accurate. I've yet to see a car which doesn't read higher on the speedo

Drive a C4. Its spot on. Not sure if the digital dials make any difference but at 75mph on sat nav my speedo was flicking between 74 and 75.

 

[Hayley]

My speedo is 10 mph too fast pmsl.

 

[MRBILLYUK]

If my speedo reads 80 the gps shows 79 on the flat .

 

[edde]

On the flt the GP is spot on.
Up a hill though the GPS is likly to be out by a tiny amount not as much as speedos are though usually though.

 

[sneeks]

As others have said the gps is more accurate. My Clio speedo reads 70mph while the gps reads 67-68mph.