What type of gunner ratio is required for an evaluator onboard the aircraft during GT-IV?

The correct answer indicates that a 1:1 gunner ratio is necessary for the evaluator onboard during GT-IV. This means that for every evaluator present, there should be one gunner. This ratio is crucial because it ensures that the evaluator can provide direct oversight and guidance to the gunner during their operational tasks.

Having a one-to-one ratio allows for effective communication and immediate feedback, which is essential in training environments where the gunners are developing their skills and need to be closely monitored. The evaluator's role is to assess performance, identify areas for improvement, and ensure safety protocols are adhered to, all of which are more manageable with a dedicated gunner for each evaluator.

In this context, other ratios may suggest a decrease in supervision quality or an increase in the workload of the evaluator, which could lead to oversights and inadequate training. Therefore, the 1:1 ratio is the optimum structure for achieving the desired training outcomes during GT-IV.