I printed the ALDHA PDF guide off the internet before leaving for my attempted thru-hike last spring. When I got to Hot springs I threw it away and bought the data book for $4.95 at the outfitter there.
(BTW, the outfitter in Hot Springs can recommend a person who is a whiz with a sewing machine…he sewed the straps back onto my pack…the outfitter called him and he drove down in less than 20 minutes, picked up my pack and had it back to me in less than a half an hour completely repaired. In less than an hour I was ready to get back on the trail, and he only charged me 15 bucks. This guy used to build custom packs in Salt Lake City, Utah and is trying to get going in Hot Springs–he does quality work.)
My opinion is that the data book is all you will ever need. Sometimes there were laminated copies of the maps in the shelters, but on the whole they were just extra tidbits. The elevations and mileage on the maps are often wrong due to trail re-routes, and you do get a lot of elevation info from the data book, just no profiles. Sometimes the town information was even wrong in both the guides and the data book.
The bottom line is that nothing is set in stone. If you are counting on some little store in some one horse town then you may be disappointed. I remember carrying leftovers, including a whole apple pie out of a dinor in one little town because the resupply point I was counting on had closed 2 years before. I did two almost 20 mile days into Erwin because Moffits store wasn’t around anymore, and I was going slow and averaged 8-10 miles a day throughout my entire hike.
Read the journal entries of southbounders regarding water sources once you get into Virginia. The ones listed may have dried up or be very muddy.
I’d also like to say here that I think it is important for hikers to maintain the water sources. Many times I found a pile of damp leaves and was able to dig the leaves out and find a small pool of water that many people would have just passed on by. And this was in an area of Virginia where water sources were very scarce, to the tune of one every 10 miles or so. Try to leave things a little better than you found them.
On the whole, the data book will be enough if you pay attention to the shelter registers and what other hikers say about resupply and water sources.
This is my experience from Springer to Waynesboro in 2002.
Matt
Mattthew Goss