@karry - great work, thank you very much! This is surely a step in the right direction! I have just published a new release: 0.5.0 This release addresses the GUI shortcoming highlighted by @Feathers McGraw: its possible to specify units (Metric or Imperial). Since we use only km and mi., there is no need to separate british from american, as far as I understand to select the map (and few other settings), you are shown directory or file selection dialog. Should work for SD cards as well.