Originally Posted by
Seattle Forrest
You told us consumer-level GPS can't provide any realistic measure of accuracy. I demonstrated that it's not true. That's all. No need to get so offended, we're just talking about how stuff works here.
And I provided examples where they didn't. I'm hardly offended, never said that they couldn't provide good results (and in fact, stated that for most needs, even ones that don't work that well are more than accurate enough), just that to expect that because it is ultra-accurate satellite based it can never be off is silly.
FWIW, my $10 cycle computers and my $30 cell phone are generally within 1% of each other, and rarely more than 1.5% off, far better than any accuracy I actually need in real life. That does not mean they cannot differ substantially, and differ from my expectations on known courses, though.