This app is a wireless fishfinder app "Tankenmaru SMART". (free) With fishfinder, you can detect the topography of a school of fish and the bottom of the water and check the situation. It can be used on fishing boats equipped with the app-compatible finder-maru master unit and Tankenmaru SMART FISH FINDER. The finder circle is an epoch-making system that can wirelessly catch the fish finder image from the parent machine fish finder and watch the fish finder image at hand. ■ Information on ships