Lowrance has unveiled three touch-screen GPS handhelds in its new Endura line; all are capable of supporting marine maps. The $229.99 Out&Back (pictured) comes preloaded with a base map and offers downloadable mapping options as well as support for shared Web-community content and plug-in microSD cards. The $384.99 Safari combines advanced mapping ability with a trip  computer, electronic compass and barometric altimeter; it also comes preloaded with a base map and supports microSD cards and downloadable maps. The $549 Sierra features a high-accuracy 3-D digital compass and barometric altimeter; it comes preloaded with high-detail topographic maps and contains 4 GB of internal memory. All units include a microSD expansion slot that supports up to 32 GB of storage for mapping, pictures and MP3 audio files; they come housed in rubberized armor and run on two AA batteries. The Sierra is waterproof to IPX7 standard (withstands immersion in one meter of water for up to 30 minutes). Call 800-324-1356, or visit www.lowrance.com/endura.