This document discusses methods for estimating target distances when giving fire control orders. It outlines 5 key methods: 1. Using recognizable distance units like meters to estimate how many "fit" between the observer and target. This works up to 400 meters. 2. Studying visual details like color and clarity to judge distances based on experience. Ranges from 100-600 meters are estimated. 3. The "halving" method of picking a halfway point and doubling the distance to that point. 4. "Bracketing" by giving a range bracket like 200-400 meters and taking the average. The bracket should be wider for longer distances. 5. Using a known range point within