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| There are 319 entries in the glossary. |
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| S.O.S. | S.O.S.
In 1904, the Marconi company suggested the use of "CQD" for a distress signal. Although generally accepted to mean, "Come Quick Danger," that is not the case. It is a general call, "CQ," followed by "D," meaning distress. |
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| S.S. | Prefix before a ship's name to indicate that she is a steamship. |
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| Sacrificial Anode | A metal, usually zinc in salt water or aluminum in fresh, affixed to the outside of a vessel intended to erode by galvanic electric current (caused by the immersion of dissimilar metals in water, much like a battery) so that useful metal parts are not corroded. |
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| Saddle | A block of wood or a bracket attached to a spar to support another spar attached to it. |
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| Safety Harness | A device worn around a person's body that can be tethered to jack lines to help prevent a person from falling overboard. |
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| Safety Pin | (1) Any pin that is used to prevent a fitting from falling open. (2) A pin used to keep the anchor attached to its anchor roller when not in use. |
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| Sagged | When from some cause a vessel's form is so altered that the ends of the keel are much above the level of its midship portion, it is said to be "sagged." The opposite of hogged. |
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| Sail | A large piece of fabric designed to be hoisted on the spars of a sailboat in such a manner as to catch the wind and propel the boat. |
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| Sail Shape | The shape of a sail, with regard to its efficiency. Controls such as the cunningham, boom vang, outhaul, traveler, halyards, leech line, sheets, and the bend of the mainmast all can affect sail shape. Also sail trim. |
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| Sail Track | A slot into which the bolt rope or lugs in the luff of the sail are inserted to attach the sail. |
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| Sail Trim | The positioning and shape of the sails to the wind; To sheet in or out the sails for the most optimal performance and speed |
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| Sailboat | A boat which uses the wind as its primary means of propulsion. |
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| Sailcloth | A fabric, usually synthetic, used to make sails. |
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| Sailing By The Lee | Sailing on a run with the wind coming over the stern from the same side as the boom (danger of jibing). |
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| Sailing Directions | Publications that describe features of particular sailing areas, such as hazards, anchorages, etc. |
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