Before splitting a 200 meter bracket during an impact registration, what does the observer do?

The correct option focuses on the necessity of spotting the rounds for deviation before splitting a 200 meter bracket during an impact registration. This action is crucial because it allows the observer to assess how the rounds are impacting in relation to the target. By determining the deviation (the difference between the observed impact and the desired target point), the observer gains critical information on whether additional adjustments are needed to ensure the rounds are landing accurately.

Accurate spotting helps identify if the rounds are consistently off to one side or another, which guides the observer in deciding the next steps, such as making corrections if needed. Understanding the nature of the deviation before any modifications or adjustments can substantially increase the effectiveness of the artillery fire.

Other choices imply actions that assume the observer already has adequate data for adjustment without first verifying the current round impacts. Spotting for deviation is foundational leading to informed decisions on how to manage the bracket split effectively.