Sat Nav.

[owenemyr]

Using the corvette's sat nav, is it possible to get an accurate speed reading for calibrating the potential overead of the speedo (for obvious reasons)
There is a facility to give you a time remaining/distance remaining based on your speed, but I have yet to find a direct gps based calculation.
Some gps systems have this useful facility.
Does anyone know?

[c4koh]

My TomTom reads exactly the same mph as my Corvette's speedo, so 70mph on the dash is 70mph on the GPS. I'd expect the sat nav to be fairly accurate - there'd be no particular reason why it shouldn't be. Similarly, against my Cadillac, the satnav would show 70mph with a dash read out of 77mph or so. So it meant the Caddy was 10% over calibrated. Similar in my wife's Citroen, the speedo showing about 10% less speed than the satnav.

[owenemyr]

If it is generally true that the corvette speedo is accurate, then S**t!!!.
I was hoping that after a short burst on the M3 (via camera van) that it would have been overeading by about 5%, will just have to wait for the post.

[franv8]

On me old C4 (with the earler fully digital love it or hate it dash) - speedo is accurate to GPS up to 60, then at a reading of 70 it's doing 72mph and a reading of 148...

[godzilla]

To answer your actual question: no, not that I've found. There is no speed readout on the C6 sat nav.

However, the US cars' speedos are supposed to be very accurate, but the Euro ones, due to different regulations, overread by quite a lot.

At 197, compared to my Garmin GPS, it was overreading by a good 11mph!
About 7-8mph at 80.

[owenemyr]

Mine is an US sourced car, so I had better assume that the speedo is accurate.
Thanks.