Global Positioning Systems (GPS) are popular with walkers and explorers as they can give you location and time information in all weather conditions anywhere on earth. The GPS system is not infallible as it will only work if there is an unobstructed line of sight to four or more GPS satellites, so as a rule of thumb they will not work indoors, underwater or underground. In some mountainous regions GPS signals may also be lost in certain areas to to obstruction in the satellites line of site, so it is always a good idea to have a map and compass as back-up.
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