I wish I would has seen yours before I did this . Very simular to yours except, I had added a route connecting all the shelters. Yes, some of the shelter were orphaned because of several being in the same area.

I didn't know you could do what you did with Access. I used a map authoring program called ExpertGPS which will output .gpx then converted to .kmz using Google Earth. More details on my web at

http://www.travelbygps.com/z_links/appalachian_trail.php

Travel by GPS is a free site for downloading GPS data for recreational activites from all over the world. Contributors welcome.