Abstract: An inflatable floating boat lift device constructed of a flexible impermeable fabric comprising main air chambers and a network of hoses and valves connected to a blower controlling the inflation and deflation of each main chamber independently. This device provides vertical lifting and stability of the boat while floating at the surface of the water. There are smaller adjustable buoyancy devices inside the main air chambers that provide floatation of the device when the main chambers are deflated. These buoyancy devices also guide the boat onto the lifting device. On some embodiments, a level sensing device activates blowout plugs that rapidly return the boat to it's original floating position.

Abstract: Submarine (6) devices consisting of cavity to hold sand and an inflatable air bladder (10) are located beneath and connected to floating buoys (2). The weight of the sand when put inside the cavity is enough to sink buoy (2) until submarine (6) sits on the bottom of a lake or river. When bladders (10) are inflated by air supplied by an air compressor or a portable air tank, and distributed through a network of polyethylene tubing. They create enough buoyancy to offset the downward pull of the sand, thus allowing the buoys (2) to float back to the surface of the water.