What do two whistle blasts indicate in swiftwater rescue?

In swiftwater rescue operations, two whistle blasts serve as a crucial communication signal to indicate the need for the team to move upstream. This signal is important because it provides clear instructions that can be easily recognized even in chaotic environments, such as during a rescue scenario where noise from rushing water can impede verbal communication.

Moving upstream can be necessary for several reasons, such as positioning oneself better to access the victim or to avoid hazardous downstream conditions. This practice enhances the safety and efficiency of rescue operations, ensuring that rescuers can approach the incident site with a better understanding of their surrounding environment and possible escape routes.

Understanding the context of these signals is vital for teamwork and ensuring a coordinated response during emergencies.