The Map Library Subscription card provides unlimited downloads for one-year to the DeLorme Map Library using Topo USA 8.0 software (sold separately). This library lets you select U.S.geographic areas of interest and download USGS 7.5-minute topographic quad maps, color satellite maps, and NOAA nautical charts using the NetLink tab of Topo USA. Once downloaded, they’re yours to keep. Topo USA software is available separately or included with the DeLorme Earthmate PN-Series GPS. Topo USA contains the blended DeLorme vector street and topographic maps. The additional map types downloaded from the Map Library are yours to layer on the DeLorme PN GPS, enabling you to switch among map types of your GPS location. It’s amazing!