This is an application to display maps provided by Geospatial Information Authority of Japan Please view the following link if you want to know more about the GSI map. http://www.gsi.go.jp/kikakuchousei/kikakuchousei40182.html Features: 1, Display the main the map types published by Geospatial Information Authority of Japan. 2, OpenStreetMap is also a option for your convenience. 3, Can measure distance and area space. 5, Can display the location and elevation information on detail screen