The maps provided by the PMC are pretty sketchy, which usually isn’t a problem since the routes are so well marked with arrows on utility poles and such that it’s easy to stay on course. Nevertheless, from time to time someone misses a turn. I’ve done it. Then you don’t know where you are and how to get back on the route you’re supposed to be riding. The PMC maps don’t show anything beyond the roads of the route and so, are not much help.
With the maps I’ve made, if you have a smartphone, you can view the routes in some map app at the same time as seeing your own location on the map. For example, I’m importing the route data (the KML file) into “My Places” of Google Maps, then viewing the routes in an iPhone app, My Maps.
I can’t guarantee that my maps are completely accurate, but I think that they’re close enough.
posted @ 02:19 PM EST