When is a gun-target line considered hot?

A gun-target line is considered hot once the firing unit is actively firing. This means that a designated artillery unit or platform has begun launching rounds toward a specified target. Once the firing commences, the line is deemed hot because it indicates that munitions are in the air and the potential for impact on the target area is imminent.

This understanding is crucial for coordinating fire support, as it informs all involved units to maintain awareness of the fire danger and potential collateral damage in the vicinity of the target. Communication and safety protocols are especially important at this stage to avoid friendly fire incidents and to ensure all personnel are aware of the current fire situation.