![]() Gross and Net Tonnage should not be confused with Suez Canal Tonnage, which uses a slightly different formula to calculate the toll for transiting the canal.Most port/anchorage dues apply to ships based on their Net Tonnage. This is the tonnage that determines the earning capability of the vessel. Net Tonnage, on the other hand, is the volume of only the cargo carrying spaces on the ship. Most Maritime Regulations (SOLAS, MARPOL etc.) apply to ships based on their Gross Tonnage. The tonnage is calculated by a complex formula that is not within this article’s scope. This includes the Engine Room and other non- cargo spaces as well. Gross Tonnage is the volume of all enclosed spaces on a ship. Some ship terms and definitions, though commonly famous in day-to-day life, are often misused on ships. (Image Credits: Hydraulic Watertight Door closing arrangement A remote indication of the status (open / close) of watertight doors is required by regulations. Most of the doors on car carrier vessels and Ro-Ro decks are watertight. Watertight doors are located below deck level and are designed to open and close upwards or sidewards (usually by automatic means). On the other hand, watertight doors are designed to prevent water ingress from both sides, thereby ensuring that the watertight integrity of the neighbouring compartment of the ship is not lost. These doors are designed to open outwards, thereby ensuring a positive pressure should a draught of water act on them. Most of the doors on deck/accommodation on tanker ships are weathertight doors. Their main use is to prevent the ingress of green seas into the space of the ship they are designed to protect. This generally includes a small head of water. They are designed to prevent the ingress of water from outside to inside. Weathertight Doors are primarily located above the waterline of the vessel. The key difference between these two doors on ships is the location of their siting. These ship terms might not be very famous among people outside the industry but are well known among maritime professionals. Fairleads, Chocks, Bitts, Bollards, Bilge And Dolphins ![]() Warm the Bell: To prepare for an early departure or end of a watch. Train Smash: A breakfast dish made from tomatoes Stoker: A marine technician - the term is derived from the days when ships were coal burners whose furnaces required frequent stoking. Skulk/Skulking: The act of knowingly avoiding work Irish Pennant: A loose end of material hanging off a uniform The following is a brief collection of terms and sayings that may be heard in most RAN ships or establishments.Īll nighters in: All night in one’s bed/night without going on watchĪloft: Anything above the main deck of the shipĪlongside: Against the side of the ship, such as the wharfĪmidships: The centre part of a ship or boatĪs you were: A warning to return to your original positionīadges: Short name for continuous service badgesīait Layer: A member of the cookery branchīight: A loop or slack in a length of ropeīlack Cat: A person with more impressive stories than youīuffer: Sailor in charge of the boatswain branchĭibbie: A member of the Boatswains branchĭouble Duffer: A member of ships’ company who consumes two servings of dessert Naval slang has been used since the formation of the RAN, much of it taken from the Royal Navy. Romans used the term ‘Sarraccenorum Admiral’ inserting the letter ‘d’ that we know today. The word Admiral may be traced from the Arabic word ‘Amir-al-bahr’, meaning ‘Commander of the seas’. Many of the naval terms we use today have been used for hundreds of years. Over the years hundreds of naval words, terms and expressions have found their way into everyday vernacular, including well-known ones such as “the cat is out of the bag”, “above board”, “long shot” and “over a barrel”. Ships’ officers would sell the fat to tallow makers, with the resulting proceeds kept as a “slush” fund for making small purchases for the ships’ company. When the lower block of a tackle was run close up to the upper one, so that the blocks were together and could be hoisted no higher, they were said to be “Chock-A-Block”. The term “Slush Fund” was also originally a nautical term: the slush was the fat or grease skimmed from the top of the cauldron when boiling salted meat. It comes from the days of sail when blocks and tackle were in common use in a ship’s rigging. ![]() The term “Chock-A-Block”, meaning ‘full’, is a naval expression. ![]()
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