Which communication method is least effective during a noisy rescue situation?

In a noisy rescue situation, verbal commands tend to be the least effective communication method. The surrounding noise, whether from rushing water, wind, or other rescue personnel, can significantly impede the ability to hear and understand spoken instructions. This can lead to miscommunication or confusion, which can jeopardize the safety and effectiveness of the rescue operation.

In contrast, hand signals are visual and can be seen from a distance, making them a useful method in loud environments. Whistles can cut through the noise and serve as a clear signal that can be heard over long distances. Radios, while also requiring an audible command, can allow for clearer communication when there is appropriate use of volume and earpieces, mitigating some of the ambient noise challenges. Thus, verbal communication falls short in noisy contexts, making it the least effective choice among these options.