Isotherm
It is a ship that serves as a lighthouse. It fixes the anchor and generally has no means of propulsion. To construct a lighthouse, iso lines are used where the depths are too deep, and instead of representing the coastline, the marine transportation routes are shown. Because it is higher visibility than the buoy, it is excellent as a means of supporting maritime traffic. They are also equipped with data recorders for oceanographic studies in general, and they also serve as weather stations. The first iso was installed in 1732 by inventor Robert Hamblin on Norse of the Thames River in England.