Carlos Manager displays the location on OpenStreetMap which is available free of charge. If your pocket phone is online and you are 100% sure it will always stay online (abroad as well), you can skip this part, but even so, we recommend creating offline maps to speed up the plotting of maps. Offline maps are created using the Mobile Atlas Creator application, which can be downloaded here for free. Save the created map on the SD card of your smart phone into the folder "osmdroid".
Watch the video instructions on how to create Offline maps: