PortableApps.com needs your help: Please consider making a donation today.300+ free and legal portable apps (over 9GB), up-to-date, & new apps regularly (Dec 04, 2013: Firefox Aurora and Nightly).Get the encrypted PortableApps.com Carbide or the fast PortableApps.com Companion. And a new way to carry your KeyZ!
This app lets you save maps for offline use. It it opensource under the GNU GPL v2 license.
Thank you so much!