What is the use of an emergency bivy sack?

• A. Reflect body heat, temporary shelter
• B. Insulation and wind protection for hypothermia
• C. Loud signal for vessels
• D. Hot, dry skin, confusion, unconsciousness

Answer: (B)

An emergency bivy sack is used to prevent heat loss in cold-water emergencies by providing insulation and wind protection. It creates a small, warm microclimate around you and blocks wind from stripping away body heat, helping to slow the onset of hypothermia when you’re waiting for rescue or after a capsize. It’s not meant as a signaling device, nor is it used to treat symptoms like hot, dry skin or unconsciousness. Its main purpose is to trap heat and shield you from cold wind and wet conditions, keeping you warmer and drier in an emergency.