When should the observer-target direction be sent again?

The observer-target direction should be communicated again when there is a change of more than 100 mils. This threshold is significant in ensuring accuracy in the positioning of artillery fire or other supporting weapon systems. A large change in the observer-target direction indicates that the previous information may no longer be valid, potentially affecting the effectiveness of the fire support being requested.

Sending a new observer-target direction after a change greater than 100 mils helps maintain the precision required in fire support operations, allowing the supporting units to accurately target their ordnance on the intended objective while reducing the risk of collateral damage. This standard practice emphasizes the critical nature of maintaining clear and current communication between observers and fire support units, ensuring operational effectiveness in dynamic combat environments.