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IAMSAR Volume 4 is divided into several chapters and sections, covering a range of topics essential to SAR operations. Some of the key components include:

. This is the most famous volume, carried on ships and aircraft. It tells the story of the "On-Scene Coordinator" (OSC)—the captain or pilot who arrives first and must take charge, launch lifeboats, and communicate with the distressed craft. Why you might see "Volume 4" references:

Actually, the International Aeronautical and Maritime Search and Rescue (IAMSAR) Manual officially consists of only three volumes

may not be an official title printed on a UN document, but to rescue professionals, it is a lifeline. It is the difference between a chaotic, emotional response and a methodical, disciplined rescue operation.