Abstract: A modular protection and security device for protecting a boat within a slip having: a stationary bowed frame positioned over the boat slip; a plurality of stationary frame tracks mounted to a side of the stationary bowed frame; a plurality of upper track rollers mounted to the stationary bowed frame; a moveable bowed frame mounted to the upper track rollers and slidable over the stationary bowed frame; a plurality of moveable frame tracks, each moveable frame track mounted to a side of the moveable bowed frame; a plurality of lower track rollers mounted to the movable bowed frame positioned for rolling within in the stationary frame tracks; a first flexible sheath mounted to the stationary bowed frame and a second flexible sheath mounted to the moveable bowed frame, wherein the first flexible sheath is configured to fit between the moveable bowed frame and the stationary bowed frame.