A current drift and set is displayed on own ship's trail(*1) to observe a wide range of tidal currents. Own ship's drift can be grasped at a glance. Rips between two different currents can also easily found on the graphic display of current, water depth and temperature (*2) changes with time. Ship Speed Current Display 1(graphic) Current Display 2 (numeric) Ship Speed Display 3-layer current values Fore/aft speed Port/starboard speed Water temperature graph -3-layer current values