The present invention relates to a mechanism for actuating four degrees of freedom of a foil (1) on a hull (10) of a boat which comprises the cooperation of a sealed foil well (15) passing through the boat from the deck through the boat hull (10) under the boat for the passage of the foil, a hoist for translating the foil into the foil well (15) characterized in that two foil holding boxes hold the foil (1) in the foil well (15), namely a top adjustment box (15), a follower box (16) in the low position on the hull, the navigator applies the settings to the top box (15) by actuating the ends (11, 12, 13) which act according to three degrees of freedom in rotation, the bottom follower box (16) adapts its position by taking up the forces and automatically follows the setting.
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