What level of accuracy can an observer achieve when scaling direction from a map using a protractor?

When scaling direction from a map using a protractor, an observer can achieve an accuracy of 10 mils. This precision level is important in fire support operations, where precise targeting is critical for mission success and safety.

The protractor, being a tool designed for measuring angles, allows the observer to take readings that are refined enough for tactical applications. In military operations, especially in artillery and air support, every mil matters when determining the correct firing solution. The 10 mil accuracy strikes a balance between operational effectiveness and the practical limitations of field equipment and conditions.

This level of accuracy is especially vital because a 1 mil deviation at a distance translates to significant lateral distance when targeting, which could affect the effectiveness of ordnance and the safety of friendly forces. Therefore, while higher accuracy could theoretically be desired, the practicality of achieving and delivering a consistent 10 mils direction scaling is recognized as a standard within military operations.