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List of the suppliers of the world's undersea communications cables — at KIDORF.com "Internet/Tel Undersea Cables of the World". Archived from the original on 2 January 2013}: CS1 maint: bot: original URL status unknown ; Map of all submarine communications cables currently in use — at KDDI.com, July 2002
Therefore, the majority of these types of devices are either water resistant or waterproof. Marine electronics devices include chartplotter, marine VHF radio, autopilot and self-steering gear, fishfinder and sonar, marine radar, satellite navigation device, fibre optic gyrocompass, satellite television, and marine fuel management.
Submarine cables are made of copper or optical fibers, surrounded by several protective layers of plastic, wire or synthetic materials. Cables can also be composed of dielectric fluids or hydrocarbon fluids, which act as electrical insulators. These substances can be harmful to marine life. [127]
NMEA 2000, abbreviated to NMEA2k or N2K and standardized as IEC 61162-3, is a plug-and-play communications standard used for connecting marine sensors and display units within ships and boats. Communication runs at 250 kilobits-per-second and allows any sensor to talk to any display unit or other device compatible with NMEA 2000 protocols.
Submarine internet cables are privately owned, mostly by telecommunications companies. [8] However, tech companies have started investing in the cable business as well (such as Meta and Google). Most cables are owned and managed by consortiums of companies. [8] In UNCLOS, owners are liable for damages that could happen to the cables (article 114).
Communication with submarines is a field within military communications that presents technical challenges and requires specialized technology. Because radio waves do not travel well through good electrical conductors like salt water, submerged submarines are cut off from radio communication with their command authorities at ordinary radio frequencies.
Watercraft can be grouped into surface vessels, which include ships, yachts, boats, hydroplanes, wingships, unmanned surface vehicles, sailboards and human-powered craft such as rafts, canoes, kayaks and paddleboards; [3] underwater vessels, which include submarines, submersibles, unmanned underwater vehicles (UUVs), wet subs and diver ...
A central oil channel in the conductor facilitates oil flow in cables up to 525 kV for when the cable gets warm but rarely used in submarine cables due to oil pollution risk with cable damage. Mass-impregnated cables have also a paper-lapped insulation but the impregnation compound is highly viscous and does not exit when the cable is damaged.