Which form is used by an observer to track rounds and spot the registration point?

The form used by an observer to track rounds and spot the registration point is the DA 5429. This form is specifically designed for artillery operations, allowing observers to accurately record and communicate the performance of the fire mission, including details about the impact point and adjustments needed for subsequent rounds.

In artillery training and operations, accurate tracking of rounds is essential for effective targeting and achieving desired effects on the battlefield. The DA 5429 provides the necessary structure for recording this vital information efficiently, enabling artillery units to effectively adjust their fire.

The other forms listed serve different purposes and are not utilized for this specific task. The DA 4187 is commonly used for personnel actions, while the DA 2185 is utilized for tracking ammunition. The Shell Report is typically a more general term and may not provide the same structured approach as the DA 5429 when it comes to detailed round tracking in an observer's context.