You can use apps such as . . . http://navigatorfree.mapfactor.com/en/ . . . which is an offline app that uses OSM - you download the app and then you can download free maps for just about anywhere in the world - I have the US, Mexico, Canada on my Samsung Galaxy S7 micro SD card - there are other programs and apps that use OSM maps - I am not sure which is best - I have a couple in our computer but only Navigator in a phone - you have to download new maps or update as OSM continually updates - only by using OSM online can you be sure you have their most recent - but others won't be far behind so offline maps can be very reliable too.