Abstract: A boat includes a hatch assembly for closing an opening in the coach roof of the boat. The hatch assembly includes a roof part which is movable between a first position in which the opening is open and a second position in which the opening is closed. Additionally, the roof part is movable to a third position above and substantially in alignment with the second position. Front and side walls are provided between the roof part and the coach roof when the roof part is in the third position to substantially enclose the opening in the coach roof.