Originally Posted by sibhusky
Why does the average speed show 22.9 one place and 38.65 another?
Next try this on a winding mountain road with tree cover. Or a deep canyon.
Good question... Usually there are a lot of runs, and I've never really thought about the full day's average, what with stops, and lunch, etc. Looking through the FAQ, it looks like the average speed on a run doesn't include time while stopped, and the total average does.
Looking in the help and FAQ files, I did come across this :
"... these [data] can vary in accuracy over the plot, but generally altitude is 5-10% and speed is 10-15%."
"... for iPhone 4, 4s, and 5 maximum speed is fairly accurate around 5%"
So the maker's think those are the accuracy of the recording, based on their testing (no idea how extensive, except it says they tested with three different android phone types, plus the iPhones I guess). They do mention a few times that they were working (at that time in 2013) on better algorithms to improve things.
They also say that the slope given is the slope skied, not the slope of the hill. So if you shallow-Z your way back and forth, it should show a fairly shallow slope.
As far as a winding mountain road or deep canyon, that's going to be rough to come by around here, but I'll try to remember to try it out on something at least a little hillier and more winding.