A slight note on distances.  My new Tech4o Traileader 1 watch seems to be fairly accurate, maybe overstating the distances a bit, whereas the iPhone is crap due to the heavy tree cover - if it even works.  Today is a good example.  My watch said 5.9 miles, iPhone said 4.23.  Along the way I was comparing my watch to the trail signs which state distances.  It was 0.1 miles over the first one at I think the 1.3mi mark.  The other day when I checked it, it was only 0.1 over after 3 something miles.  In general the watch seems fairly close, at most 10% over, probably more like about 5%.  I expect, since it bases it on stride, that it will vary based on how hilly a particular run/trail is, etc.  I intend to go calibrate it, but I'm not sure where yet, since doing so on a track will make it accurate for the street/track, but probably not quite as right for trails.