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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I understand what you say but as DEIACCORD states they are as about as accurate as you are going to get and I have tried it over long distances in order to get as accurate reading as possible. The GPS and the speedo very nearly agree with each other to +/- 1mph at 70mph.
Over a short distance it would be innacurate as sometimes the fix can be 10m out and if the next fix it gets a few seconds later is 10m away it could record you as doing some ridiculous speed even when standing still. the better ones average the speed out over a time for accuracy.