Movement of Fleets
Left-click to select a fleet and then right-click to move it to any part of the highlighted area - this is the extent of its movement capability during a single turn.
Blocking Movement
Positioning a fleet in the straits between two of Japan's great islands enables that fleet to block other fleets from using that route and enemy armies or agents from crossing between the headlands by use of the land bridges that stretch between them.
Generals at Sea
As the concept of dedicated admirals didn’t exist in Japan at this time, a general simply controls a fleet of ships in exactly the same way as he does an army. Simply order your general to board a fleet for him to take command.