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MAPS.ME has maps for every country in the world, including islands. You can check how detailed they are on OpenStreetMap.org. To download maps, you can:
1. Zoom in the map of needed area until "Download" button appears
2. Tap the country or city name on the world map and then tap download icon in the pop-up window
3. Find a map in the list of countries (Menu → Download Maps)
4. Create a route and the app will prompt you to download all the necessary maps
See also: I can't download maps. It always fails