Marine transponders; Electronic receivers, transceivers and displays for marine vessel collision avoidance utilizing Universal Shipborne Automatic Identification System (AIS); Electronic devices for marine vessel navigation and electronic devices for marine vessel safety, namely, GNSS receivers, AIS receivers and transponders, wireless routers, and protocol converters; antennas; signal splitters for electronic apparatus; electronic cables; Electronic devices, namely, transponders, shore stations, and Aids to Navigation for protecting surface and subsurface equipment from damage by vessels; marine radio communication machines and apparatus; marine electronic devices, namely, vessel monitoring systems consisting of display monitors and computer processors and associated application software to interact with marine sensors; software for protecting surface and subsurface equipment from damage by vessels; computer application software for mobile devices, namely, software for remote monitoring, configuring, and providing alerts and notifications for marine vessels