Abstract: A hydraulic lift device for in-water boat hoists. A hydraulic cylinder is utilized to extend and retract a cylindrical rod with a vertical cross member at its end. Lift cables are attached to the cross member on opposite sides and extend rearwardly toward the hydraulic cylinder. One cable is horizontally reversed, 180° by a pulley, with both cables then directed 90° downward over respective pulleys and affixed to opposite ends of the cradle of the hoist, equalizing end to end lift. Side to side lift may be equalized by a second parallel device or by levelings cables. Primary components are contained within an attached enclosure, above water level. Remote operation and solar power may be provided.