37 Installation, maintenance and repair of on-board systems mounted on vessels and seaborne systems in the nature of on-board dynamic control equipment for naval platforms, namely, computer hardware and electronic command system for use in automatically maintaining control of a vessel's position and course using the vessel's propellers and thrusters, computer programs and computer software used in the calculation of a mathematical model of a marine vessel in the fields of hydrodynamics, fluid mechanics, and automation and optimization systems, automatic steering systems for marine vessels, namely, for ships, submarines and seaborne and subsurface drones, consisting of computer software, gyroscopic sensors with GPS functions, proximity detectors, motion detectors, distance sensors, measurement sensors, dynamic positioning systems, namely, GPS navigation devices consisting of gyroscopic sensors with GPS functions, proximity detectors, motion detectors, distance sensors, measurement sensors, systems for stabilizing the movements of vessels, namely, axis anti-roll equipment for ship navigation, consisting of passive anti-roll tanks, fin anti-roll stabilization, dynamic anti-pitch stabilization, rudder roll stabilization, and zero- or low-speed anti-roll stabilization automated systems for supervising the steering of marine vessels, namely, ships, consisting of computer hardware and electronic command system for use in automatically maintaining control of a vessel's position and course using the vessel's propellers and thrusters automated recovery systems for manned and unmanned marine vessels, namely, ships and seaborne drones, consisting of a positioning laser and a mechanical coupling device, measurement or testing apparatus, namely, for laboratory or field testing in the field of hydrodynamics and fluid mechanics measuring or testing, study and training simulators, namely, flight simulators for use in pilot training and ship navigation simulators, platform and safety simulators, and tactical simulators for use in shipboard operator training, autonomous aircraft, seaborne and subsurface vessels, namely, helicopters, boats, ships, and submarines, and unmanned aircraft, seaborne and subsurface vessels, namely, drones