What is the circular error of probability for the M41A7 when finding coordinates?

• A. 5 meters per 500 meters
• B. 10 meters per 1000 meters
• C. 15 meters per 500 meters
• D. 20 meters per 2000 meters

Answer: (B)

Circular error probable is the radius within which about half of coordinate determinations or impacts are expected to fall around the true point. For the M41A7 when finding coordinates, the standard figure is 10 meters at 1,000 meters. In practical terms, if you’re locating a target at 1,000 meters, roughly half of your coordinate findings will be within 10 meters of the actual location. This error scales with distance, so at 2,000 meters the CEP is about 20 meters, at 500 meters about 5 meters, and so on. That 10 meters per 1,000 meters is the conventional way the accuracy is stated in manuals, which is why it’s the best choice. The same relationship can be written as 5 meters per 500 meters, but the canonical form used here is 10 meters per 1,000 meters.