AR山ナビ -日本の山is a free app that allows you to identify mountains in Japan by simply pointing your camera towards them. It uses AR to display the name and altitude of the mountain on your screen. If the AR ridge is not aligned with the actual ridge, you can swipe to adjust it. The app also provides a terrain view that allows you to see a wider area.

The app has data for over 16,000 mountains in Japan, including information on lakes, tall buildings, landmarks, and more. It uses 3D coordinates and a gyro sensor to display the information accurately. You can take a picture with the mountain's name and share it via email or other apps. Additionally, you can add mountain names to photos taken with other apps. All features of the app are free to use.

Please note that if the app is used near metal objects or magnets, it may not display the correct direction. The accuracy of the location may also be affected by GPS, gyro sensors, and electronic compasses. The terrain data is not as precise as the actual view. The app is intended for use in Japan only, and it uses data from the National Geographical Survey of Japan.