Are those jagged lines on the trace caused by gps inaccuracies?
Most of these go away when you zoom in - the line is pretty fat in gmap4 because I use the original GPX format for those maps, and GPX doesn't let you set line weight. I removed most of the GPS scatter with a filtering application (GPX Editor) that also reduced the number of points by about 30%, so the majority of these clusters of bouncing lines at each break should have been removed. Zoom in in Topo view and you will sometimes see that what looks like scatter in Terrain view is actually a tight set of switchbacks with the directional arrows making up the majority of what looks like random scatter. The only time the GPS wanders is when you totally stop, and that is where you get about 10% extra distance on each day, especially on rainy days when you sit around for hours and the GPS wanders around wondering if you have moved or not. Once moving, it usually stays very much on track and doesn't wander more than 50 feet off course laterally, even in deep valleys. Go to Satellite view on that Day 7 map and zoom in deeper than Topo view allows and you will see that most of these fuzzy areas are actually very tight switchbacks.
