how "out" is your speedo!

I've heard about the hills thing with sat navs, but surely the fact that they use at least 3 satellites to triangulate your position means they can tell your height as well?

Presumably it must be a failing on behalf of the software if it doesn't take into account the height of the vehicle when calculating speed?
 
Mine is exactly the same as gps (Garmin C310 full reception) which is quite strange as my last car was almost 10mph out!
 
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