Quote:
Originally Posted by
josephau
Please educate me. Why would a GPS speedo reading be necessarily more correct than an OEM speedo reading? The former is being read off from a satellite which is thousands of miles above where the bike is. From what I've read so far, it seems to me that there is a general assumption the GPS reading is more accurate than the OEM's, why?
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If GPS was inaccurate it would be no good for telling you where you are
The satalites may be a long way a way but by triangulalting the distance from up to 6-7 satalites at one time a gps unit can give you a pretty good indication of your actual land speed which is going to be quite accurate.
An oem speedo may not be necessarily inaccurate but are usually made to show a higher speed than is actually done in an effort to keep actual speeds within legal limits (as most people seem to speed by just a few mph)