The most up-to-date quick-reference guide to the Appalachian A consolidation of the most basic information from the 11 official guidebooks into a lightweight table of distances between shelters, campsites, road-crossings, and major features, updated in December to account for Trail relocations, new (or removed) shelters, and other changes. Keyed to both guidebook sections and maps. Indispensable for hiking the A.T. Twenty-seventh edition.
If you want to hike the A.T., this book should prove a invaluable resource. Updated annually with changes to important features for hikers, like locations of water, campsites, shelters and distance/direction to towns along the trail, the Trail Data Book is perfect for planning. I look forward to obtaining the 2017 edition to finalize plans for my hikes this summer.
For people doing the AT I'd recommend the AT Thru-Hikers' Companion as there is more information inside; the data book is a repetition of what is written in the AT Thru-Hikers' Companion. If you solely wanna have the key data regarding towns and shelters, then this one is a good option (also lighter than the other one).