Figure B-2. Sector sketch.
To obtain proficiency in the 100-meter unit-of-measure technique requires dedicated practice. Throughout training, the soldier should compare his estimated range to the actual range determined by pacing or other reliable means. The best training technique is to require the soldier to pace the range after he has made a visual estimation, realizing the actual range for himself. This teaches him more than being told by the instructor/trainer.
One shortcoming of the 100-meter unit-of-measure technique is that its accuracy is depends upon the amount of visible terrain for ranges up to 500 meters. If a target appears at a range greater than 500 meters, and the soldier can see only a portion of the ground between himself and the target, it is hard to accurately use the 100-meter unit-of-measure technique.
The Appearance-of-Objects Technique. This technique determines range by the size of the object observed. This is a common technique of determining distances and is used by most people in their everyday living. For example, a motorist trying to pass another car must judge the distance of an oncoming vehicle. He does this based on his knowledge of how vehicles appear at various distances. Suppose the motorist knows that at a distance of 1 mile an oncoming vehicle seems to be 1 inch wide and 2 inches high. Then, anytime he sees another oncoming vehicle that fits this dimension, he knows it is about 1 mile away. This same technique can be used by the firer to determine ranges on the battlefield. If he knows the size and detail of personnel and equipment at known
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