I'd make it a single player UI as an option only when there is just one player. Running around in the boat to adjust here and there while making an attack run might be a bit too much when you are all alone. If it is an option, you can still choose between running around or using icons to set speed etc., me thinks.
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"I invite you to go inside this submergible hole in the water where you can nicely hide from destroyers."
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