Now, I've had this problem with my Lexus and my Supra and possibly my Saab and it's this..
When I'm travelling along at, say, 80 m.p.h. the speedometer on the dashboard will say 80 but the speedometer on my satnav will say 73. This happens with my Tomtom as well as my previous satnav.
Question is, which one is right? I would have thought that the calculations made by the satnav would have indicated an accurate m.p.h. but I'm not so sure.
Thoughts? :S
When I'm travelling along at, say, 80 m.p.h. the speedometer on the dashboard will say 80 but the speedometer on my satnav will say 73. This happens with my Tomtom as well as my previous satnav.
Question is, which one is right? I would have thought that the calculations made by the satnav would have indicated an accurate m.p.h. but I'm not so sure.
Thoughts? :S