Japan Alps Hiking Map is a map application that can be used as a hiking/outdoor GPS. By downloading data such as maps, routes, and place names that you plan in advance, you can check your current location with GPS even if you are in a no cellular signal area like mountains. This app is a great tool for anyone who enjoys hiking and other outdoor activities.

Additionally, the app has a "Footprints" feature which allows you to view other hikers' GPS logs. This lets you see the routes they have taken, ensuring that you won't get lost or that you are on the right path.