A boat lift for raising boats out of the water to facilitate maintenance and to reduce corrosion and contamination. The boat lift includes two or more boat lift assemblies positioned and spaced apart so that each boat lift assembly lifts approximately the same fraction of the overall weight of the boat. Each boat lift assembly has a lifting structure with bunk cushions mounted on pivoting bunk bases to prevent damage to the boat hull when lifting. Hydraulic lift mechanisms are enclosed within each boat lift assembly providing a cleaner appearance as well as protection against corrosion and fouling. A dual-pulley mechanism enables lifting distances substantially larger than the length of the lift mechanism. A hydraulic control system ensures that all the boat lift assemblies move up and down simultaneously and at the same rate, thereby maintaining the boat horizontal at all lifting positions.

A system and method are provided for presence based automatic operation of a marine barrier gate for protecting a secured area. Embodiments include a system having RFID sensors outside and inside the secured area, and proximal the gate. A controller verifies that a user is authorized to enter the secured area when one or more of the RFID sensors communicate with a user identification unit carried by the user; opens the gate or causes the gate to remain open when the user's authorization to enter the secured area is verified; tracks a location of the user identification unit using the RFID sensors while the gate is open and the user is transiting the gate; and closes the gate when the RFID sensors are no longer in communication with the user identification unit.

An apparatus manages a dock, a portion of which is disposed over a body of water, from a remote device. A control unit is disposed on the dock. A plurality of sensors is each in data communication with the control unit. Each of the plurality of sensors includes: an electric shock sensor; a water level sensor that senses a distance to the water from a predetermined location of the dock; and a theft detection circuit. A communication chipset is in data communication with the control unit. The control unit includes a processor that is programmed to transmit to the remote device via the communication chipset an indication of the following: a shock likelihood sensed by the electric shock sensor; a level detected by the water level sensor; and an alert when the theft detection circuit detects a likelihood of theft.

An adjustable leg for use with a dock includes a tubular, lower member having a non-circular cross-section when taken normal to a longitudinal axis where the lower member has a first end and a second end. The lower member further includes a plate secured to the first end, the plate having a threaded through bore, and a disc secure to the plate. The disc has an elliptical aperture that is biased from the plate. The adjustable leg includes a tubular, upper member having a non-circular cross-section when taken normal to the longitudinal axis. The upper member is sized to be positioned over the lower member. The upper member further includes a threaded rod rotatably positioned within an interior cavity of the upper member, the threaded rod rotatably secured to the upper member. The threaded rod is configured to threadably engage the threaded bore and wherein the disc is configured engage the threaded rod and to place upward pressure on the threaded rod to prevent or reduce unwanted rotation of the rod.

An adjustable leg for use with a dock includes a tubular, lower member having a non-circular cross-section when taken normal to a longitudinal axis where the lower member has a first end and a second end. The lower member further includes a plate secured to the first end, the plate having a threaded through bore, and a disc secure to the plate. The disc has an elliptical aperture that is biased from the plate. The adjustable leg includes a tubular, upper member having a non-circular cross-section when taken normal to the longitudinal axis. The upper member is sized to be positioned over the lower member. The upper member further includes a threaded rod rotatably positioned within an interior cavity of the upper member, the threaded rod rotatably secured to the upper member. The threaded rod is configured to threadably engage the threaded bore and wherein the disc is configured engage the threaded rod and to place upward pressure on the threaded rod to prevent or reduce unwanted rotation of the rod.

A ground mounting assembly includes one or a plurality of posts, each attached to at least one stabilizing plate or scoop pyramid. The post may be driven into the ground and then lifted to deploy plates into a locking mechanism, or driven into the ground by a pile driver with plate held in place, released, and driven further and deployed into a locking mechanism, or driven into the ground and double pounded inside the post to drive reinforcing plate into slotted winglets, or driven, double pounded and rotated to extend the reinforcing plates horizontally from the pole or pile. The post also can used as a mooring in harbors, lakes, or at sea. A system based on a double pounder pile driven mono pole, optionally extendable in length, is also described.

An ice ramp system for a dock including a catch plate adapted for horizontal mounting on a dock side surface of a dock; a plurality of ice ramps; a plurality of brackets, each bracket including a triangular cross-section with a bisecting element; an angled ice ramp support face for angularly supporting an ice ramp; a notch at a lower end of the support face for receiving an edge of an ice ramp; a hook that extends from an upper end of the support face that is mountable to a dock top surface; and a backplate having a downwardly extending tongue that mates with the catch plate.

A vessel barrier system to prevent vessel movement through a passageway includes a flexible vessel barrier element Coupled to one or more energy dissipating units. The vessel barrier element may be a single, typically large diameter element, for example a large diameter, high strength synthetic rope, or alternatively may be a barrier net suspended on a number of floats. The vessel barrier element is coupled by a cable to the energy dissipating unit(s), which may be large weights suspended from a frame. When a vessel contacts and moves the vessel barrier element, placing it in tension, the weights are moved from a first, lower position, to a second, elevated position. The kinetic energy of the vessel is transferred to an increase in the potential energy of the weights, and the vessel is brought to a stop. The system is particularly suitable for Large Displacement Vessels or LDVs.

A vessel barrier system to prevent vessel movement through a passageway includes a flexible vessel barrier element Coupled to one or more energy dissipating units. The vessel barrier element may be a single, typically large diameter element, for example a large diameter, high strength synthetic rope, or alternatively may be a barrier net suspended on a number of floats. The vessel barrier element is coupled by a cable to the energy dissipating unit(s), which may be large weights suspended from a frame. When a vessel contacts and moves the vessel barrier element, placing it in tension, the weights are moved from a first, lower position, to a second, elevated position. The kinetic energy of the vessel is transferred to an increase in the potential energy of the weights, and the vessel is brought to a stop. The system is particularly suitable for Large Displacement Vessels or LDVs.

An ice ramp system for a dock including a catch plate adapted for horizontal mounting on a dock side surface of a dock; a plurality of ice ramps; a plurality of brackets, each bracket including a triangular cross-section with a bisecting element; an angled ice ramp support face for angularly supporting an ice ramp; a notch at a lower end of the support face for receiving an edge of an ice ramp; a hook that extends from an upper end of the support face that is mountable to a dock top surface; and a backplate having a downwardly extending tongue that mates with the catch plate.