Continuation of Boat Terminology Part IV
- Sail ties: Lengths of light line or tape used to secure a sail to the boom after lowering.
- Schooner: A yacht in which the after mast is taller than the main mast.
- Sea anchor: This is a device to hold the bow of a boat into the wind when neither sailing nor anchored.
- Sea clutter: This is a control on a radar display that reduces unwanted beam reflections caused by waves close to the boat.
- Set: The direction towards which the tidal stream flows.
- Sheet: A control rope attached to the clew of a sail or the boom, in case of the mainsail.
- Shorten sail: To reef the sails or change to sails of a smaller size.
- Sill: A wall or dam across the entrance to a harbour or marina.
- SOLAS: Safety Of Life At Sea. This is a code of practice issued by the IMO to regularise safety equipment and classification aboard all vessels at sea.
- Speed made good: The speed of a vessel over the ground.
- Spring tide: A tide where the tidal range is large and the streams are at their strongest.
- Springs: Ropes rigged to prevent a boat from moving forward or aft when secured alongside.
- SSB: Single Side Band. This is a mode of emission of a radio signal, which optimises range and signal strength at the expense of sound quality. Therefore, it's ideal for Morse code or voice, but not for music radio transmissions.
- Stanchions: Metal poles that support the guard rail lines.
- Starboard: The right-hand side of the boat when you're looking forward.
- STCW: Standards of Training Certification for Watchkeeping for Seafarers. It's an IMO convention that was substantially reviewed by a diplomatic conference in July 1995 to become known as STCW95.
- Steaming light: Is the alternative name for masthead light. It's used when the vessel is driven by power.
- Stern light: This is the light positioned at the stern of the boat. It's white and has a sector of 135˚ in total, which is 67,5˚ on either side of the fore and aft line. It's the same as the overtaking light.
- Storm: A wind of, or exceeding, Beaufort Force 10.
- Storm jib: A small headsail set in strong winds.
- Swashway: A channel of deeper water, normally into a harbour or river.
- Tack: To change course through the wind and set the sails on the other side.
- Tell-tails: Small pieces of wool or cloth on the luff of a sail to indicate the path of the wind over the sail.
- Thames tonnage: A measure of the volume of a vessel, not the weight. Originally used for taxation purposes.
- Tidal range: The vertical distance between the level of high and low water.
- Tide: The vertical rise and fall of the water level.
- Topping lift: A line from the masthead to the end of the boom, used to support the boom when the mainsail is lowered.
- Traffic separation scheme: An area of one-way traffic lines where special rules apply.
- Transducer: The unit of an instrument system that converts depth, speed, etc into electrical signals.
- Transit: Two objects are in transit when they are seen one behind the other, so in 1 straight line.
- Transom: The flat part of the hull across the stern.
- Traveller: A metal car on a track that allows the mainsheet lower end to move across the boat from one side to the other.
- Tri-coloured light: A red, green and white light on the top of the mast. This may replace the lower green, red and stern light when under sail.
- Trip line: A light line between the crown of an anchor and the anchor buoy.
- Trysail: A small, heavy sail used to replace the mainsail in very strong winds.
- Underway: A ship is underway when it's not attache to the seabed.
- Up and down: The state of the anchor cable, when being weighed, just before it breaks out of the seabed.
- Veer: The wind veers when it shifts direction in a clockwise direction.
- Veer: To pay out an anchor cable or rope.
- VHF: Very High Frequency. A short range radio band for transmission and reception, normally in line of sight. The marine stations use the band between 156MHz and 174 MHz.
- VRM: Variable Range Marker on a radar display.
- Wear: To change tacks by moving the stern of the boat through the wind.
- Weigh: To weigh the anchor means to raise the anchor.
- WGS: World Geodetic System. This is the Chart Datum system.
- Withies: Small sticks or saplings used in rivers to mark the deeper water.
- Yawing: Swinging from side to side of the set course.
- Yawl: A two-masted yacht where the after mast is aft of the rudder post.
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