The A.T. Guide is the guidebook of choice for hikes of any length on the Appalachian Trail. The book contains thousands of landmarks such as campsites, water sources, summits and gaps. The trail's elevation profile is included and every landmark is aligned to the profile. Hikers using this guide know where they are on the trail, what views, streams and campsites are ahead, and whether they'll be hiking uphill or downhill to get there.