Disclosed herein is an inflatable watercraft barrier in one example having an inflatable perimeter tube. Also disclosed is a diaphragm sealed to the perimeter tube to form the watercraft barrier between a watercraft and the water in which the watercraft barrier and watercraft float. In one example, a portion of the perimeter tube forms a gate portion which is at least partially selectively deflated so as to be denser than water, and therefore rotates about a gate pivot such that the watercraft may enter the watercraft barrier through the gate portion. Also disclosed is a water pump in fluid communication with the watercraft barrier so as to evacuate water from between the watercraft barrier and the watercraft.

A boat lift assembly is configured to support a boat adjacent a dock and permit relative horizontal shifting of the supported boat into and out of a berth defined at least partly by the dock. The boat lift assembly includes a boat lift, an elongated carriage track, and a shiftable carriage. The boat lift includes a vertically-shiftable platform to support and position the boat. The carriage track is configured to be attached relative to the dock and extend horizontally along the length of the berth. The shiftable carriage is operably attached to the boat lift. The carriage is slidably supported at least in part by the carriage track to slide along the length thereof and shift the boat lift and boat horizontally relative to the berth.

A boat lift assembly is configured to support a boat adjacent a dock and permit relative horizontal shifting of the supported boat into and out of a berth defined at least partly by the dock. The boat lift assembly includes a boat lift, an elongated carriage track, and a shiftable carriage. The boat lift includes a vertically-shiftable platform to support and position the boat. The carriage track is configured to be attached relative to the dock and extend horizontally along the length of the berth. The shiftable carriage is operably attached to the boat lift. The carriage is slidably supported at least in part by the carriage track to slide along the length thereof and shift the boat lift and boat horizontally relative to the berth.

A floating dock system can include a base portion, a cradle, at least one guide assembly, and a lift assembly. The base portion can include a lateral deck portion extending along a first plane and defining a boat slip, and at least one float element configured to provide a float element buoyancy force sufficient to maintain at least part of the deck portion above the water surface. The can include a lateral upper portion extending along a second plane, and a support structure configured to support the nautical vessel. A guide can include male and female guide portions. A lift assembly can include a motor configured to move the cradle between upper and lower positions.

A floating dock system can include a base portion, a cradle, at least one guide assembly, and a lift assembly. The base portion can include a lateral deck portion extending along a first plane and defining a boat slip, and at least one float element configured to provide a float element buoyancy force sufficient to maintain at least part of the deck portion above the water surface. The can include a lateral upper portion extending along a second plane, and a support structure configured to support the nautical vessel. A guide can include male and female guide portions. A lift assembly can include a motor configured to move the cradle between upper and lower positions.

A boat lift has pumps that evacuate water from flotation containers lower the boat lift. Multiple flotation containers are retained by a frame that is formed as a grid. The pumps are contained within a housing that is retained in position by the frame. Water enters the housing through valves and is distributed to the flotation containers to lower the boat lift. Water is evacuated from the flotation containers by pumps, with valves closed to prevent water from entering the flotation containers.

A boat lift has pumps that evacuate water from flotation containers lower the boat lift. Multiple flotation containers are retained by a frame that is formed as a grid. The pumps are contained within a housing that is retained in position by the frame. Water enters the housing through valves and is distributed to the flotation containers to lower the boat lift. Water is evacuated from the flotation containers by pumps, with valves closed to prevent water from entering the flotation containers.

A floating dock system can include a base portion, a cradle, at least one guide assembly, and a lift assembly. The base portion can include a lateral deck portion extending along a first plane and defining a boat slip, and at least one float element configured to provide a float element buoyancy force sufficient to maintain at least part of the deck portion above the water surface. The can include a lateral upper portion extending along a second plane, and a support structure configured to support the nautical vessel. A guide can include male and female guide portions. A lift assembly can include a motor configured to move the cradle between upper and lower positions.

A floating dock system can include a base portion, a cradle, at least one guide assembly, and a lift assembly. The base portion can include a lateral deck portion extending along a first plane and defining a boat slip, and at least one float element configured to provide a float element buoyancy force sufficient to maintain at least part of the deck portion above the water surface. The can include a lateral upper portion extending along a second plane, and a support structure configured to support the nautical vessel. A guide can include male and female guide portions. A lift assembly can include a motor configured to move the cradle between upper and lower positions.

A boat lift has pumps that evacuate water from flotation containers lower the boat lift. Multiple flotation containers are retained by a frame that is formed as a grid. The pumps are contained within a housing that is retained in position by the frame. Water enters the housing through valves and is distributed to the flotation containers to lower the boat lift. Water is evacuated from the flotation containers by pumps, with valves closed to prevent water from entering the flotation containers.