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TermDefinition
- IsobarOn a synoptic chart, a line joining points of equal pressure Read more
- Isolated Danger MarkBuoy or pillar positioned on a dangerous underwater obstruction Read more
- IsophaseA light where the duration of light and darkness are equal Read more
- JackstayA jackstay is a length of webbing (or on rare occasions a length of wire) which run from the bow to the stern of the vessel. They have(...) Read more
- Jammers (see Clutches)Jammers or clutches are used to secure lines that have been tensioned on a winch. The jammer or clutch holds the rope should the winch be needed(...) Read more
- JibTriangular headsail set on a stay forward of the mast Read more
- Jib SheetsLines attached to clew of headsail to control sail shape. Read more
- Did you know?, Phonetic Alphabet Joo Lee Ett Phonetic alphabet letter J. Emergency Situations: A vessel displaying the Juliet flag indicates a serious emergency involving hazardous(...) Read more
- Did you know?, Phonetic Alphabet Juliett Phonetic alphabet letter J. Emergency Situations: A vessel displaying the Juliet flag indicates a serious emergency involving hazardous(...) Read more
- Jury RigA temporary but effective device that replaces lost or damaged gear Read more
- KedgeA technique for moving or turning a ship by using a relatively light anchor known as a kedge. Read more
- Kedge AnchorA lightweight anchor used to move a boat or anchor temporarily in fine weather Read more
- KeelA structural element that sometimes resembles a fin and protrudes below a boat usually along its centre line Read more
- KetchA two-masted fore-and-aft rigged sailboat with the aft mast (the mizzen) mounted (stepped) afore (in front of) the rudder. Read more
- VangLine or tackle to pull the boom down to keep it horizontal Read more
- Kicking StrapLine or tackle to pull the boom down to keep it horizontal Read more
- Phonetic Alphabet Kilo Phonetic alphabet letter K. Communication Request: A vessel displaying the Kilo flag indicates a desire to establish communication with(...) Read more
- KnotThe unit of speed at sea; nautical miles per hour; A fastening made by looping a piece of rope, or something similar on itself and tightening it Read more
- LandfallLand first sighted after a long voyage at sea Read more
- LanyardA short length of line used to secure an object such as a knife Read more