Abstract: A vessel propulsion system includes a bow thruster located at a bow of a hull, an outboard motor located on the hull and provided separately from the bow thruster, and a navigation controller. The navigation controller controls at least one of the bow thruster and the outboard motor in accordance with a state of at least one other of the bow thruster and the outboard motor.

Abstract: A vessel propulsion system includes a bow thruster located at a bow of a hull, an outboard motor located on the hull and provided separately from the bow thruster, and a navigation controller. The navigation controller controls at least one of the bow thruster and the outboard motor in accordance with a state of at least one other of the bow thruster and the outboard motor.

Abstract: A vehicle inclination angle detector is configured to suppress the difference between an actual vehicle inclination angle and a calculated vehicle inclination angle to allow for stable detection of the same. The detector includes a vertical acceleration sensor, a lateral acceleration sensor, an inclination angle calculating module and a calculation cancelling module. A detection direction of the vertical acceleration sensor with respect to the vehicle is determined such that its acceleration in the gravity direction is detected when the vehicle is in a non-inclined state. Acceleration in the lateral direction is detected when the vehicle is in the non-inclined state. The inclination angle calculating module calculates an inclination angle of the vehicle in the lateral direction based on the detected vertical acceleration and the lateral acceleration.