Just came across this site that allows you to create and download your own maps for each of your devices. http://mobac.sourceforge.net/ Mobile Atlas Creator (formerly known as TrekBuddy Atlas Creator) is an open source (GPL) program which creates offline atlases for GPS handhelds and cell phone applications like TrekBuddy, AndNav and other Android and WindowsCE based applications. For the full list of supported applications please see the features section. Additionally individual maps can be exported as one large PNG image with calibration MAP file for OziExplorer. As source for an offline atlas Mobile Atlas Creator can use a large number of different online maps such as OpenStreetMap and other online map providers.