lifeguards. Nonetheless, smaller pools often do not have qualified personnel. Water park – Whilst water parks are a type of swimming pool, they can be considered a unique type of facility as they may involve additional features such as water slides or wave generators, or shallow pool play areas Ocean lagoon or tidal pool – These enclosed areas use seawater, but like a pool have a limited and contained area, but have the potential for additional hazards above and beyond an artificial pool Waterfront – Lifeguards can look after in a non-surf, open-water areas such as lakes, rivers, streams, and lagoons that are found at public parks, resorts, summer camps and campgrounds. Open ocean – In some cases, people may swim in the open ocean from a boat (such as a cruise ship) and lifeguards may be employed for safety in this instance. Positioning Lifeguards have a primary duty to supervise their responsibility area. To achieve this the lifeguard needs an optimum position to observe the public. This is often best achieved from an elevated position, which can be a chair, platform or the roof of a vehicle. This allows them maximum visibility over their supervised area and may facilitate communication between them and their team. Some lifeguard teams use portable platforms or chairs which can be moved to the most appropriate position. This can take account of changes such as a specific activity taking place, prevailing wind direction or simply enable lifeguards to move closer to the water if the tide goes out on a beach. The chair or tower can also act as storage for the lifeguard, holding important rescue and communication equipment nearby. It can also act as a recognizable point for the public to find lifeguard assistance. For this reason, it is often marked with a flag or flags to enable location by the public. These flags may also give information to the bathers about current swimming conditions. Other options, depending on the location, can include patrolling the edge of the water on foot, which allows closer interaction with the public, and the opportunity to provide face to face reassurance and advice, or supervising from within or on the water, which is most applicable in open water (such as the sea or even a large water park) where lifeguards can use boats or other personal watercraft to be in the water, which extends their range and