Matches my Garmin, as far as I can see, but I'll do more tests - with both HUD and Garmin in the frame, so will have three different GPS readings to compare (the front dashcam got GPS too).And...is it accurate?
Yes! However, my speedo is actually reasonably accurate, as I changed the tyres from 215/40 R18 to 225/40 R18, over two years ago, and really glad I did - better ride quality, and I regard the speed shown as exact, so no subconscious "I can go 3mph faster" factorI do find Mercedes between 2 & 3 mph overly optimistic in the speed department