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Maps have been largely replaced by GPS systems these days because of their ease in use, transportability and accuracy. It determines the exact position of the user through satellites and thereby is a traveller’s best companion. These can be used in car, motor bikes, by athletes, walkers, climbers, mariners, etc. The in-car systems come in different options like component based systems, PDA based, SmartPhone and dataloggers.

GPS systems of yester years used fewer satellites but the modern ones use 12 to 24 satellites, more number only means accurate result with no delay. This constellation of satellites transmits microwave signals that are captured by receivers and thus its location, speed, time and direction can be evaluated. The GPS system deployed has its own display touch screen and audible directions can supply this information to the user with choice in selecting from different languages. Users can also determine the number and types of maps required and storage of the same. An antenna is included in the unit itself.

The top players in providing these systems are Garmin, Magellan, Tomtom and Mio. There are others like ViaMicelin, Navman, etc. Most models come with other features like calculator, measurement converters, world clock, audio books, picture viewer etc. They are also some that come with water proof standards.