The A.T. is marked for daylight travel in both directions using a system of white "blazes," or a rectangle of white paint 2 inches wide and 6 inches high. Blazes are found on trees, posts and rocks. Posts and rocks called "cairns" are also used to identify the route in some places. Side trails and shelter trails use blue blazes, and blazes of other colors and shapes mark other intersecting trails.
Distance between blazes varies. If you have gone as much as a quarter-mile without seeing a blaze, stop. Retrace your steps until you locate a blaze. Then, check to make sure you haven't missed a turn. When your map or guidebook indicates one route, and the blazes show another, follow the blazes.