GPS is a satellite-based navigation system that was originally developed for military use but is now widely used by civilians. It works globally in all weather conditions and provides location data 24/7. GPS is commonly used in vehicles for navigation, in cell phones, and to geotag photos. It helps with tasks like recovering stolen vehicles and emergency response. Newer GPS devices have features like voice guidance in multiple languages. When purchasing a GPS unit, it is best to select one with at least 12 satellite channels and 8 megabytes of memory for clear reception and storage of maps.