The use of a whistle is especially helpful to rescuers during periods of __________ ___________.

• A. Restricted visibility
• B. High winds
• C. Heavy rain
• D. Darkness

Answer: (A)

Audible signaling becomes essential when you can’t rely on sight. A whistle produces a sharp, piercing sound that carries over water and through wind and engine noise, so rescuers can hear you even when visibility is poor. It’s simple to use, doesn’t require batteries or fuel, and you can repeat patterns to indicate distress clearly. In restricted visibility, being heard by rescuers is often more reliable than being seen, so the whistle is especially valuable.