The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From ZOOMO Inc.:
This is a sightseeing application. The distance from the compass present location which teaches not north but the direction in Tokyo Sky Tree is also known. It also becomes the compass of Tokyo Tower or Mt. Fuji, and will be helpful on the popular view deck. Furthermore, their specific addresses and spots, such as a house, are also registered and it is made to being made to compass. If the upper right N button is pushed, north will also be displayed simultaneously. It is safe, also when a sky tree is not immediately discovered from a distance or a place is not nearby known in the shadow of a building, etc. while going to travel.