just got back from my trip.
here are some interesting results.....
the trip to my parents place...
1 % over on a 171 km trip
odometer reads 173.3 km
actual (gps) reads 171.5 km
the trip home (slightly different route home)
1.3 % error on 178.9 km trip
odometer reads 181.2 km
actual (gps) reads 178.9 km
the differences between the trip there and back might be put down to the fact that it was wet and rainy in the way home with complete cloud cover.
this might have added to any small error with the gps's accuracy. im not sure, but even with the differences, it's too small an amount to worry about (imho)
however, i have noted some very incorrect speed readings from the speedo on the maj. bellow are the results and these figures are the same no matter what the weather conditions, the error percentage is the same every time.
Indicated Speed.............Actual Speed
60 km/h..............................57 km/h
70 km/h..............................66 km/h
80 km/h..............................75 km/h
90 km/h..............................85 km/h
100 km/h............................92 km/h
110 km/h...........................102 km/h
120 km/h...........................111 km/h
130 km/h...........................120 km/h
140 km/h...........................130 km/h
so the speedo consistantly reads under at All road speeds.
i wonder if it can be re calibrated to read correctly ?
jason