Abstract: A system has a submarine vessel and a submarine docking port. The docking port is arranged for transfer of electrical energy to the submarine vessel when the submarine vessel is docked. The submarine vessel has a submarine navigation system. The docking port has a primary coil for emitting a magnetic field. The submarine vessel has a secondary coil. The submarine vessel has means for measuring a strength of the magnetic field received by the secondary coil. The submarine vessel has a positioning electronics that guides the submarine vessel in a horizontal plane to maximize the measured local magnetic field. The positioning electronics guides the submarine vessel in the vertical direction when the measured magnetic field is at a local maximum and the magnetic field increases when the submarine vessel descends towards the primary coil. Also, a method is for docking a submarine vessel on a submarine docking port.

Abstract: An inductive communication unit is for use in two-way communication. The unit has a transmitter coil configured to generate a first alternating magnetic field representing first information to be transmitted, and a receiver coil configured to receive a second magnetic field representing second information to be received. The transmitter coil and the receiver coil are arranged extending in parallel in vicinity to each other and positioned overlapping each other in part to an extent that, upon exposure of the first alternating magnetic field to the receiver coil, an overlapping portion of the receiver coil induces a first current and a nonoverlapping portion of the receiver coil induces a second current, and where the first and the second currents are of same magnitude and opposite polarity.

Abstract: An inductive communication unit is for use in two-way communication. The unit has a transmitter coil configured to generate a first alternating magnetic field representing first information to be transmitted, and a receiver coil configured to receive a second magnetic field representing second information to be received. The transmitter coil and the receiver coil are arranged extending in parallel in vicinity to each other and positioned overlapping each other in part to an extent that, upon exposure of the first alternating magnetic field to the receiver coil, an overlapping portion of the receiver coil induces a first current and a nonoverlapping portion of the receiver coil induces a second current, and where the first and the second currents are of same magnitude and opposite polarity.

Abstract: A docking port is for an unmanned aerial vehicle being a rotorcraft, said docking port having at least one primary coil. The docking port has a primary coil housing formed with a funnel shaped indentation adapted to receive a complementary frustoconical shaped external surface of a secondary coil housing positioned on a landing gear of the rotorcraft, and the primary coil is formed to follow closely a funnel shaped indentation surface. The rotorcraft is charged wirelessly by the primary coil in the primary coil housing and a secondary coil in the secondary coil housing. The invention further concerns the landing gear and a system comprising the docking port and the landing gear. A method for docking the unmanned aerial vehicle on the docking port by use of a magnetic homing field is described.

Abstract: Apparatuses and methods are for monitoring conditions in a fluid reservoir while sealing a passage between the fluid reservoir and an adjacent environment. A first assembly has a primary barrier in fluid communication with the fluid reservoir and adapted to block the passage between the fluid reservoir and the adjacent environment. A second assembly has a secondary barrier in fluid contact with the adjacent environment and adapted to block the passage between the fluid reservoir and the adjacent environment. A first inductive communication means is placed in the first assembly and a second inductive communication means is placed on an opposite side of the secondary barrier. The respective communication means are arranged to communicate with each other. A monitoring means is in fluid communication with the fluid reservoir and transfers information to the first inductive communication means for transferring data gathered from monitoring conditions in the fluid reservoir.

Abstract: Apparatuses and methods are for monitoring conditions in a fluid reservoir while sealing a passage between the fluid reservoir and an adjacent environment. A first assembly has a primary barrier in fluid communication with the fluid reservoir and adapted to block the passage between the fluid reservoir and the adjacent environment. A second assembly has a secondary barrier in fluid contact with the adjacent environment and adapted to block the passage between the fluid reservoir and the adjacent environment. A first inductive communication means is placed in the first assembly and a second inductive communication means is placed on an opposite side of the secondary barrier. The respective communication means are arranged to communicate with each other. A monitoring means is in fluid communication with the fluid reservoir and transfers information to the first inductive communication means for transferring data gathered from monitoring conditions in the fluid reservoir.