Which statement is true regarding communication signals at aquatic facilities?

Communication signals at aquatic facilities are essential for ensuring safety and effective lifeguarding operations. The statement that they include a combination of hand signals and whistle blasts is true because these methods of communication are widely recognized and understood in the context of aquatic environments.

Whistle blasts are often used to grab attention quickly, alerting swimmers and other lifeguards to potential issues or changes in safety protocols. Hand signals provide visual cues that can convey important messages, especially in noisy environments or when lifeguards need to communicate without creating panic. This combination helps to ensure that all staff are on the same page and that swimmers can quickly respond to instructions or alerts.

The other choices present limitations or inaccuracies regarding communication protocols. For instance, communication signals cannot be solely visual or silent, as sound plays a critical role. Also, while it is true that communication signals could vary to some extent between facilities to reflect specific policies or local context, there are standardized practices that are more common. Lastly, communication signals are not limited to emergencies; they are also used for routine safety checks, swimmer management, and other operational functions.