I recently got a GPS and was using it on a long trip in my 95 GSR. The GPS was indicating a speed that was consistently 10% lower than the GSR's speedometer.

To verify, I clocked a measured mile at exactly 60 MPH (according to speedo), and low and behold -- the GPS was accurate. My factory original speedometer was reading 10% high. No wonder I got so few speeding tickets!

Has anyone else had a similar problem?

How can I fix this?

Thanks!