Crustaceans

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• Radio Waves: Radio waves are a type of electromagnetic radiation with wavelengths longer than infrared light. In maritime and seamanship context, radio waves are used for communication between ships and shore stations, as well as between ships themselve ... Read More >>
• Sound-producing Devices: Sound-producing devices are instruments or equipment used to generate sound signals in the maritime context. These devices are used to communicate with other vessels, to warn of danger, to indicate the presence of a vessel, or to provide in ... Read More >>
• Coal: Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is used as fuel for ... Read More >>