In any event there wasn't any info forthcoming on a fix, just find out how much the error is, with a GPS as you have done and compensate for it. In mine it seems to be linear, off by 4 mph at at all speeds so I just run 5 over the posted limit.
I have found that in my case it is NOT
, but logarithmic. At 60 MPH GPS says 54 MPH. AT 70 MPH, GPS says 63 MPH. At 80 MPH, GPS says 72 MPH. Seems more like a percentage-almost like an even 10% versus a continuous 5 or 6 MPH. Wondered about a resistance change in the signal. But then, what about the odometer? Is it off the same 10%? We are taking a trip to Fayetteville, AR for Bikes, Blues, and BBQ this weekend. I will set up the trip meter on the GPS for the trip and see just how much error the odometer has. Will post back after the trip.
Thanks again for the assistance.
Ride your GoldWing no faster than your angel can fly. My angel's pretty slow. Kind of like it that way, though...