Nautical apparatus and instruments, namely, satellite-aided navigation systems; marine steering and propulsion control apparatus, namely, navigation apparatus for boats, dynamic positioning system hardware and software for vessel positioning and vessel management; global positioning system (GPS) apparatus for boats; anchorless boat global positioning systems, namely, dynamic positioning system hardware and software for use in vessel positioning and vessel management; navigation apparatus and instruments for boats, namely, satellite receivers for receiving and processing positions and navigation data via satellite; marine compasses; marine depth finders; marine remote controls for controlling boats; computer software and hardware for position control of a marine vessel; electronic control systems for controlling a marine propulsion water jet, namely, computer hardware and computer software for use in adjusting, steering and keeping courses of vessels; electronic control systems for boats, namely, navigation apparatus for boats, dynamic positioning system hardware and software for vessel positioning and vessel management; computer hardware and software for vessel positioning and vessel management; measuring instruments for boats, namely, compasses, range finders, depth finders, lasers for measuring purposes, distance measuring apparatus; radar apparatus for boats; parts and fittings for all the aforesaid goods, namely, acoustic sound alarms, aerials, batteries, batteries for lighting, battery chargers, luminous beacons, underwater breathing apparatus, marking buoys, signalling buoys, directional compasses, flashing safety lights, and fog signals, namely, acoustic sound alarms or sound emitting apparatus or flashing safety lights, for indicating position in reduced visibility weather