Quick Answer
A lost hiker can survive without water for 3-5 days in a temperate climate, assuming they have access to shade, clothing, and a means of starting a fire.
Survival in the Absence of Water
A lost hiker will lose approximately 1 liter of water per day through sweating, even in cool temperatures. This can be mitigated by finding shade, removing excess clothing, and using a makeshift sun hat to prevent direct sun exposure. In most cases, a hiker can survive without water for 3-5 days, but this can be extended to 7-10 days if they have access to a reliable fire source and can use the STOP method (Stay, Think, Observe, Plan) to navigate.
Staying Put vs Walking Out
The STOP method emphasizes the importance of staying put in a designated area, signaling for help, and waiting for rescue. Walking out can increase the risk of further injury, dehydration, and exposure to harsh weather conditions. In most cases, it is safer for a lost hiker to stay put and wait for rescue, especially if they have a reliable fire source and signaling equipment. According to the US Air Force’s Survival, Evasion, Resistance and Escape (SERE) manual, staying put can reduce the risk of injury and increase the chances of rescue by as much as 50%.
Signaling for Help
A lost hiker should use all available means to signal for help, including creating a smoky fire, using flares or other pyrotechnics, and making loud noises during the day and night. The US Coast Guard recommends using a signal fire to signal for help, as it is visible from a distance and can be seen by aircraft and boats. A lost hiker should also use any available materials to create a smoke signal, such as wet leaves, grass, or small twigs. This can be used in conjunction with other signaling methods to increase the chances of rescue.
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