Navigation method for ship, and ship

A navigation method for a ship including a plurality of main generators that feed power to navigation equipment for use in normal navigation and living quarter appliances provided inside a ship body, and an emergency generator that feeds power to emergency equipment when fire or flood occurs, the navigation method comprising:

• an emergency power feeding step of feeding power to the emergency equipment using the emergency generator when at least a part of the plurality of main generators are disabled due to fire or flood;
• and
• a return-to-port power feeding step of feeding power to return-to-port equipment required for navigation for returning to a port using the main generators and the emergency generator after fire or flood has subsided;
• wherein, in the return-to-port power feeding step, the emergency generator feeds power to at least a part of the living quarter appliances, and
• wherein, in the return-to-port power feeding step, the main generators feed power to at least a part of the navigation equipment and another part of the living quarter appliances.