A portable GPS system consists of a unit that is not limited to in-car usage. Non-portable devices are usually older models that require cable links, but the same inconvenience is found with combinations of PDAs or Palms and GPS devices that have to be car powered in order to save battery life. The portable GPS unit is designed according to special standards that allow for outside usage in various  applications and sports such as hiking, climbing, cycling, fishing and the like. There are some differences between a portable GPS system and the car GPS unit, and although the functions and the features may be the same, what differs is design.

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