Many people have the need for the two basic uses of gps systems today, driving in their cars and geocaching. When using a gps system in a car, a user generally inputs an adress and the gps system takes you there using its mapping information. Generally when using a handheld GPS for hiking and geocaching, coordinates are programmed into the handheld gps system which then tells you which direction you are supposed to go and how far away you are. Most car navigation systems are not designed for this capability. However there are some gps systems out there that function well as both a hand held and car gps system, these are a few systems that you can use.
Radio Handheld models: