DeLorme, famous for its topographic and street map detail, enables anyone to use a wide variety of detailed maps and aerial imagery for all outdoor activities. The Earthmate® GPS PN-20 is a low-cost, high-sensitivity, fully integrated handheld GPS that delivers capabilities previously unavailable at any price. Includes: 12 channels, 75 MB of on board memory, 1 GB SD card, pre-loaded world wide highway / major road base map, Topo 7.0 software, 2AA batteries (also can run on Lithium-Ion rechargeables).