satnav.

[Clayton]

cant remember if we been here before. i spend half my life trailing around in my vito van and because of the distances i travel tend to rely on my sat nav as an early warning system for potential speed trapsnow one thing i have noticed is that compared to the speedo reading on the sat nav the clock on the van reads fairly consistantly 5 mph more. the burning question is has any body any thoughts on which would be the most accurate.if i am travelling through a camera infested area i usually take more notice of the sat nav to be on the safe side