Control system for outboard motor

A control system for an outboard motor that includes a propeller and is attached to a stern of a watercraft, the control system comprising:

• a driver for changing an attitude of the outboard motor with respect to the watercraft;
• and
• a controller configured to selectively implement first control that operates the driver and controls a vertical position of the propeller to a first position, and second control that operates the driver and controls the vertical position of the propeller to a second position closer to a water surface than the first position,
• a route setting device configured to set a route according to a destination of the watercraft, wherein
• the controller acquires information on a depth of water a predetermined distance ahead in a travel direction of the watercraft, and determines which of the first control and the second control is implemented, based upon the information on the water depth and a navigation speed of the watercraft,
• the controller implements the second control upon the information on the depth of water being equal to or less than a predetermined first threshold and the navigation speed being less than a predetermined second threshold, and
• upon the information on the depth of water being equal to or less than the first threshold and the navigation speed being equal to or greater than the second threshold, the controller calculates first navigation time taken to reach the destination in a case of navigation under the second control through an area where the depth of water is equal to or less than the first threshold on the route set by the route setting device, and second navigation time taken to reach the destination in a case of navigation under the first control along a changed route that detours the area where the depth of water is equal to or less than the first threshold, which is changed from the route set by the route setting device, and, upon the first navigation time being equal to or less than the second navigation time, implements the second control.