10-20 system may refer to:
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1. Lifeguard – A lifeguard is a person who supervises the safety and rescue of swimmers, surfers, and other water sports participants such as in a swimming pool, water park, or beach. Lifeguards are strong swimmers and trained in CPR/AED first aid, certified in water using a variety of aids. A lifeguard is responsible for the safety of people in an area of water, the priority is to ensure no harm comes to users of the area for which they are responsible. Lifeguards often take on this responsibility upon employment, although they can also be volunteers, the conditions resulting in drowning are summarized by the drowning chain in which each link can lead directly to an incident, or contribute to a succession of links. It consists of lack of education about water safety or local conditions, prevention is an effective skill that is vitally important to a lifeguard because it can aid in maintaining the safety of the aquatic patrons. Lifeguards must be trained, capable, and ready to perform emergency rescues should they become necessary and these rescues are the key focus of popular culture reference such as Baywatch, which was at one time the most viewed show in the world. It is important that lifeguards never allow their secondary responsibilities to interfere with their primary responsibilities, Lifeguards may also be required to attend occasional in-service meetings to strengthen their lifeguarding skills. Lifeguards are trained in a variety of different lifesaving skills, there are different variations on these skills depending on the various organizations who train lifeguards. The skills also vary depending on the facility in which they will be put to use, such as a water pool, a deep water pool. Various First Aid Skills - Used to treat injuries and sudden illnesses that can occur. Some of the various in-water skills taught are, Active-Victim Rescue - A simple rescue that moves an actively drowning victim to a safer place, Lifeguards look for swimmers in various categories and conditions, Passive drowning victims are inactive in the water, submerged or otherwise. When a lifeguard sees this kind of swimmer they perform an emergency rescue, active drowning victims are taking in water while attempting to stay at the surface. Lifeguards look for swimmers in this condition by looking for moving or flapping laterally, not necessarily flailing, with the body vertical. This behavior is known as the instinctive drowning response, Lifeguards perform an emergency rescue to assist this kind of swimmer as their behavior results from being incapable of more active efforts to survive. They may be less than 20 –60 seconds from sinking underwater, distressed swimmers are having trouble swimming, perhaps from fatigue, and may or may not be calling out for help. Lifeguards usually swim out and help these swimmers to the side and they may or may not require additional assistance. Normal swimmers are those who do not need any support and can swim on their own doing intermediate strokes, Lifeguards can be found patrolling many different types of water, and each type has its own unique features, duties and challenges. Life Guards have to be in physical condition in order to accommodate these conditions properly