Just a coincedence that both my vehicles are off by the same amount? I'm still skeptical, but just in case, I'll go 4mph faster, and tell the po po you said it was ok.
Dude. It's not a GPS issue. Lots of high-tech satellites calculating that speed. Whereas on a vehicle, changing the size of the tire can throw off the speedometer. Speedometers on vehicles are frequently off, most often on the high side.
Both vehicles have original tires. I would have thought a system directly attached to the vehicle itself would be more accurate than a signal from outer space, encountering umpteen miles of varying interference/atmospheric conditions. If you insist though, I'll go by the Zumo's speed, at least I'll get there faster,(hopefully without any tickets).
If uncorrected my car reads 6 mph high at an indicated 40. Our truck measures 6 mph slow, our Element measures 2 mph slow, my FJR reads 1-2 mph slow @ 40. My car is so far off because of the performance tires I'm running.
I had this on my wing for years: https://www.blackrobotics.com/yb_faq.htm
+1... only that SpeedHealer does not offer a Plug and Play for the the +06 models. They do offer a SH, but you have to do something similar to BJM to wire it in. Doesn't appear to difficult though.
Nuff said. I'll go with the gps reading.
