Yamaha Hatsudoki Kabushiki Kaisha

Hirotaka Tamoto

Yoshinori Yagi

Akihiro Tagata

A marine propulsion system includes a propulsion device, an up-and-down movement sensor, and a controller configured or programmed to control driving of the propulsion device and perform a wave control including an attitude control to reduce an up-and-down attitude change of a hull by temporarily reducing a vessel speed based on a measurement result of the up-and-down movement sensor each time a marine vessel rides over a wave. The controller is configured or programmed to, in the wave control, perform the attitude control when it is determined that a wave condition is a head wave, and not perform the attitude control when it is determined that the wave condition is a following wave.

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Shizuoka, Japan

Hirotaka Tamoto