The present invention relates to a motion compensation system for an element hanging from a mobile unit, the system comprising two blocks, at least two articulated arms, a compensation cylinder and a cable. According to the invention, at least one characteristic length of the articulated system (for example: the length of a link or the distance between two sheaves of two articulated arms) is adjusted according to the motion to be compensated for.

The invention is a system for controlling the relative movement of a load P, comprising at least one main damper having a longitudinal action of stroke C and two ends with one end being connected to a frame and the other being connected to the load. A compensation device is included having at least one secondary damper of longitudinal action with two ends with one end being secured to the frame and the other end is connected to the end of the main damper connected to the load The secondary damper is arranged so that, at one point of stroke C, the secondary damper has an action orthogonal in direction to the direction of the movement.

A system for launching and recovering an underwater vehicle (18), which system comprises a crane (16) and a storage location for at least one underwater vehicle (18), wherein the crane (16) is attached to the bottom of a first container (12) and the storage location is provided in a second container (14), said first container (12) being arranged on the second container (14) during an operation of launching or an operation of recovering.

A system is provided to compensate for heave of a vessel in which the compensation system has a first panel with a first magnetic field having magnetic flux disposed in a first direction and a second panel parallel to the first panel. The second panel has a second magnetic field having magnetic flux disposed in a second direction with the first magnetic field parallel to the second magnetic field. A conducting loop is located between the first panel and the second panel. The conducting loop is attachable to a cable connected to a load suspended in water. Compensating force generated by the first magnetic field and the second magnetic field transfers to the cable to compensate for heaving motion of the vessel and stabilize the cable-connected load in the water.

The recovery device comprises a floating cradle configured to receive and support the vehicle, the cradle having an entrance for the vehicle situated at a rear end of the cradle and delimited between two lateral portions, the cradle being configured or capable of being configured with a rear lateral extension extending toward the rear from one of the two lateral portions, the other lateral portion having no rear lateral extension.

The recovery device comprises a floating cradle configured to receive and support the vehicle, the cradle having an entrance for the vehicle situated at a rear end of the cradle and delimited between two lateral portions, the cradle being configured or capable of being configured with a rear lateral extension extending toward the rear from one of the two lateral portions, the other lateral portion having no rear lateral extension.

Provided is an offshore wind turbine installation arrangement, including a lifting assembly realized to hoist a suspended load between a floating installation vessel and a wind turbine assembly, the lifting assembly including a crane supported by the floating installation vessel; a sensor arrangement realized to sense at least a motion of the floating installation vessel; and a controller realized to control elements of the lifting assembly on the basis of the sensed installation vessel motion to adjust the position of the suspended load relative to the wind turbine assembly. Also provided is a method of hoisting a load between a floating installation vessel and an offshore wind turbine assembly.

The present invention provides a capturing mechanism for the recovery of at least one vessel to at least one marine platform; said at least one vessel having at least one engagement device either permanently or at least partially reversibly connectable to the same; said capturing mechanism comprising: a. at least one tensioned capturing line connected to said at least one marine platform; and b, at least one line maneuvering mechanism configured to displace said at least one tensioned capturing line in at least one direction selected from a group consisting of up, down, left, right, forward, backward, playable into said at least one marine plat form, playable out of said at least one marine platform, playable into and out of the water and any combination thereof.

The present invention provides a capturing mechanism for the recovery of at least one vessel to at least one marine platform; said at least one vessel having at least one engagement device either permanently or at least partially reversibly connectable to the same; said capturing mechanism comprising: a. at least one tensioned capturing line connected to said at least one marine platform; and b, at least one line maneuvering mechanism configured to displace said at least one tensioned capturing line in at least one direction selected from a group consisting of up, down, left, right, forward, backward, playable into said at least one marine plat form, playable out of said at least one marine platform, playable into and out of the water and any combination thereof.

Disclosed is a floating structure for an autonomous watercraft with a keel deployed and recovered on a vessel. The longitudinally elongate structure includes a floating port-side and starboard lateral edges and a submersible bottom submerged when the structure is in the water, the lateral edges and the bottom defining an interior space at least partly submerged when the floating structure is in the water, the lateral edges defining a prow at the front and, at the rear, an opening towards the rear of the floating structure, which opening is downwardly limited by the submersible bottom with at least one longitudinally elongate slot open towards the rear for the passage of the keel, and the floating structure is configured in order that at least the front portion of the autonomous watercraft including the keel can engage by floating inside the interior space, with the keel engaging in the slot.