Final answer:
The FDC requires the observer's precise location, target direction, and distance for a Polar Call for Fire. Accurate target descriptions and contextual factors like terrain and weather are also important. Clear communication is vital to ensure the safe and effective delivery of fire.
Step-by-step explanation:
Before conducting a Polar Call for Fire, the Fire Direction Center (FDC) needs to have specific information to accurately deliver indirect fire. Firstly, the observer's location must be known precisely since the polar plot mission is based on the observer's position. The observer must also provide the target direction in mils (from true north) and the distance to the target from their position. The observer's location must be accurate because the direction and distance will be used to triangulate the exact location of the target relative to the known points on a map.
The observer should also report the target description, desired effect on the target, and any pertinent information regarding terrain or weather that might affect the trajectory or visibility. Timeliness is also critical, as the battlefield situation can change rapidly.
Relaying accurate and clear information between the observer and the FDC is crucial in ensuring the effective delivery of artillery support. Any communication errors could result in fire being directed at the wrong location, causing possible friendly fire incidents or failure to neutralize the enemy.