| CPC G05D 1/0875 (2013.01) [B63B 39/061 (2013.01); B63B 79/40 (2020.01); B63B 79/10 (2020.01)] | 20 Claims |

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1. A lateral movement control method for a boat including a hull and a propulsion device, the method comprising:
generating a propulsion force to laterally move the hull based on an output from the propulsion device without turning the hull; and
executing a roll reduction process to reduce a roll angle of the hull at a time of laterally moving the hull.
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