Using a declinated M2 or a lensatic compass, what precision can an observer measure direction?

The ability to measure direction using a declinated M2 or lensatic compass is best represented by a precision of 10 mils. This level of precision allows observers to accurately determine azimuths for navigation, target acquisition, and artillery adjustments, ensuring that operations can be conducted effectively within the operational environment.

When using these compasses, the standard measurement precision of 10 mils is typically sufficient for most military operational needs, as it balances accuracy with usability in the field. This precision also corresponds to a distance of 50 meters, which falls within common operational ranges for artillery and other military coordination tasks. Thus, the choice indicating 10 mils and 50 meters directly aligns with the practical applications and capabilities of the equipment in use.

The context of the other options indicates they suggest either a higher level of precision than is standard or distances that exceed the typical requirement for effective measurements in military operations. Therefore, the correct answer illustrates the recommended capability of an observer equipped with a declinated M2 or lensatic compass.