| At Sea Glossary - J
  jettyA manmade structure projecting from the shore. May protect aharbor entrance or aid in preventing beach erosion.
 jibA triangular sail attached to the headstay. A jib that extends aft of the mast is known as a genoa.
 jib nettingA rope net to catch the jib when it is lowered.
 jib sheetA sheet used to control the position of the jib. The jib has two sheets, and at any time one is the working sheet and the other is the lazy sheet.
 jib stayThe stay that the jib is hoisted on. Usually the headstay.
 jib topsailA small jib set high on the headstay of a double headsail rig.
 jibeTo change direction when sailing in such a manner that the stern of the boat passes through the eye of the wind and the boom changes sides. Careful control of the boom and mainsail are required when jibing to prevent a violent motion of the boom when it switches sides.
   
 
 
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