Go to Setup>Map Downloads to access the map download interface. Downloaded maps are defined by an area along with a range of zoom levels to download, for use when a network connection is unavailable. Once downloaded, map tile sets are saved in MotionX-GPS permanently unless you manually delete them. Map types available for download include MotionX Terrain (based on OpenCycleMap), MotionX Road (based on OpenStreetMap), and NOAA marine charts.
Downloaded Map Details