抄録
In recent years, coral reefs decrease in Okinawa. One of the reasons is outbreak crown of thorns starfish. Hence, we have been researching to use underwater robot for exterminate crown of thorns starfish. The authors propose the maritime mobile to measure position of the underwater robot. If you measure object in underwater, usually you can use a sound wave. In this research, develop the maritime mobile which mounts monocular camera and GPS and attitude sensor. And use the maritime mobile to measure underwater objects. The author illustrates miniaturization of maritime mobile based on results experiment on the sea.