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Determine the Observer-Target (OT) Factor
16 of 27
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&pageText=To determine the observer-target (OT) factor, use the following guidelines:& &moreInfo=To determine the observer-target (OT) factor, use the following guidelines:

Step 1: Estimate the range from the observer’s location to the enemy target
(Example: 2,100 meters).

Step 2: Divide the estimated range by 1,000 (Example: 2,500 meters/1,000 = 2.5)
This is the observer-target (OT) factor.

Step 3: If the estimated range is 1,000 meters or more, round the OT factor to the nearest whole number (Example: 2.5 OT Factor = 2.0 rounded OT factor).

NOTE: Round .5 and less down to 0 and round .6 or higher up to the next whole number (Example: 2.5 = 2.0 OT factor; 2.6 = 3.0 OT factor).

Step 4: If the estimated range is less than 1,000 meters, round the OT factor to the nearest 1/10th (Example: 800 meters = 0.8 OT factor).
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