Minecraft wiki entry for Measuring_distance, associated text: Calculate a distant object's X and Z coordinates using the tilt angle in the debug screen by estimating the target's elevation from a vantage point significantly higher or lower in elevation. Typically you would pillar up about 50 to 60 blocks, or climb a tall mountain, and use the direction and downward tilt angle of the target with your coordinates to calculate first the horizontal distance to the target, then the X and Z coordinates of the target based on that distance and direction.