that condensate from the dehumidification subsystem 2 is placed in the potable water storage tanks 3 capture screen 20 is preferably equipped with hydraulic or mechanical powered devices such as motor 22 that can position the capture screen s 20 to maximize the utilization of prevailing winds that blow across the ship 1 a mounting base 24 allows rotation of capture screen 20 through an appropriate mechanism such as ball bearings 26 that are mounted to base 24 this arrangement allows a minimum of 180 u00b0 rotation in response to motor 22 cooling water which is used as a condensing agent for capture screen 20 can be introduced from the cold water from the containers 40 of the ro subsystem 4 through piping 6 c in a likewise fashion potable condensate can be removed from capture screen 20 through piping 6 p to be delivered to one or more of the storage tanks 3 in one proposed although not necessary mode of operation ship 1 would be located in a tropical environment such as the gulf of mexico locations such as this are desirable because the water has sufficient depth i e approximately 2500 feet to allow the lowering of the containers 40 of the ro subsystem 4 although it will be appreciated by those skilled in the art that any saltwater environment where such water depth and ambient air conditions exist is equally usable prior to immersion of the containers 40 and ro unit 41 of the ro subsystem 4.