This book serves as an indispensable resource for planning Appalachian Trail hikes by consolidating essential data from official guidebooks. Authored by Daniel Chazin, a recognized authority in Appalachian Trail resources, the Data Book distills critical information from the 11 official ATC guidebooks. It focuses on providing a lightweight, easily accessible table of distances between shelters, road crossings, and key features. The content is updated annually to reflect the most recent trail changes, ensuring hikers have current information for their planning needs.

The Appalachian Trail Data Book is frequently referred to as "the bible of A.T. hiking" due to its critical role in essential hike planning. Its annual consolidation of data from the 11 official ATC guidebooks makes it a go-to resource for hikers. The book's utility is further enhanced by its alignment with guidebook volumes and maps, providing a cohesive planning experience. This publication is designed to reflect all major changes from the previous 12 months, ensuring accuracy for current trail conditions.