Patent ID: 8011981

Claim:
A boat comprising: a boat propulsion unit mounted on a hull in a rotatable manner; a boat propulsion unit operation controller disposed in the hull to be steered by an operator; a steering motor to steer the boat propulsion unit based on steering control of the boat propulsion unit operation controller; a signal cable to electrically connect the steering motor and the boat propulsion unit operation controller; a steering load detector to calculate a necessary output value of the steering motor required to steer the boat propulsion unit in a traveling state; a motor output detector to detect a possible output value that can be output by the steering motor; a prediction determination unit to compare the necessary output value from the steering load detector with the possible output value from the motor output detector; and an electric power load controller to control a battery charge amount to be increased and/or to control an electric power load to be reduced when the necessary output value is determined to be larger than the possible output value by the prediction determination unit.