Car GPS devices still make great navigation aids. Why? Better and brighter color screens, improved accuracy and usability of maps and directions, added features such as traffic alerts, the ability to wirelessly link a mobile phone to an in-car unit to get hands-free mobile speaker-phone use; all of these reasons and more.Handheld GPS units have dramatically changed outdoors travel, replacing map and compass with moving digital maps, and precise location, elevation, topographic and other data. These handhelds let you enter &#34;waypoints&#34; -- precise locations -- for a favorite fishing spot, safe passage across a stream, a campsite; anything of importance to the user. Handhelds can enhance outdoor safety, as well, making getting lost much less likely, and providing precise position information that can be relayed to rescuers in case of an emergency.Some manufacturers offer GPS products specifically for cycling or running. In cycling, for example, a GPS unit can replace a conventional cycle computer, and add another layer of features, such as route mapping, and trip, heart rate, and cadence data that is uploadable to a computerized training log or to a Web site. Specialized golf GPS receivers provide precise yardage and other useful information and can be preloaded with your favorite courses.GPS has been a boon to recreational and commercial boaters. Moving-map displays and navigation overlays are incredibly convenient, easy to use, and dramatically enhance all-weather, all-light-condition safety. The ability to provide precise position information in case of an emergency is another key safety feature. Built-to-purpose, portable chartplotters often come loaded with detailed coastal maps, and many additional maps for the earth&#39;s oceans and lakes are available.Portable aviation units offer intuitive, moving-map views with navigation overlays, providing a great supplement to a plane&#39;s instrumentation. Aviation features include: map page, terrain page, route page, position data page, &#34;direct-to&#34; navigation, airport information, and more.