Considering buying a Nexus 7 too as a personal back up to aircraft's GPS. Has anyone used Android app called "Memory Map" in an Android device? Looks like quite a handy program, it's free for Android (basic maps included) and official VFR maps are 20 pounds / map. I'd need only four so 80 pounds + a device (159) that I'd probably need alsewhere too... Doesn't sound too expensive. Anyone?