There are several programs available for Linux that will interact with just about any GPS on the market. This software generally servers to either interact with or enhance the GPS unit. Programs that interact can transfer information to and from the unit, including way-points, routes, detailed maps, saved tracks and more. These usually run on a proprietary protocol, such as Garmin or Magellan. Though the protocol is considered proprietary, development is supported by most companies and is very well documented. Other types of programs enhance the GPS unit by providing a more detailed and comprehensive visual display of the information read from from the GPS. These mostly use the open source NMEA protocol to read and display data from the GPS such as position, time of day, signal strength and others. These are the types of programs this article will focus on, specifically RoadMap and GPS Drive
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