What additional method might lifeguards use to alert others aside from visual signals?

In a scenario where lifeguards need to alert others, effective communication is critical for maintaining safety. Utilizing communication equipment, such as walkie-talkies, allows lifeguards to convey important information quickly and efficiently to other team members or emergency services. This method is particularly beneficial in situations where visual signals may not be seen or recognized promptly due to distance, obstacles, or distractions in a bustling aquatic environment.

Using walkie-talkies ensures that lifeguards can maintain constant communication, coordinate their efforts, respond to emergencies more swiftly, and share vital information about incidents occurring in or around the water. This type of technology enhances a lifeguard's ability to monitor safety effectively and ensures a rapid response when required.

In contrast, bright colors in swimwear may improve visibility but do not serve as a proactive communication method. Shouting may not be effective or appropriate in a noisy environment, as it could lead to misunderstandings or panic. Visual aids can support communication but do not provide the immediate and responsive communication that equipment like walkie-talkies offers. Therefore, relying on communication equipment is a more reliable and efficient method for alerting others effectively in a lifeguard's duty to ensure safety.