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You’ll probably want to throw in an Emergency Position Indicating Radio Beacon (EPIRB) as well, so that help can locate your boat as quickly as possible.
Having a proper First-Aid Kit on board can help you render immediate emergency care, and sometimes even save a life. It's one of the safety-related items that Coast Guard Auxiliary and United States Power Squadrons® vessel examiners discuss when conducting an annual Vessel Safety Check (VSC) on recreational boats.