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J
Jammer Another word for a cleat
Jib The small sail in front of the mast
Jib Sheet The rope used to control the jib
K
Kicking strap The rope system that is attached to the base of the
mast and the boom, helping to hold the boom
down
Knot A measurement of speed, based on one minute of
latitude
L
Launching To leave the slipway
Latitude Imaginary lines running parallel round the globe
from east to west. They help you measure position
and distance on a chart.
Leech The back edge of the sail
Leeward The part of the boat furthest away from the
direction in which the wind is blowing
Leeway The amount of sideways drift caused by the wind
Leverage The result of using crew weight as a ‘lever’ to
counteract heel caused by the wind
Lie to A way of stopping the boat temporarily by easing
sheets on a close reach
Lifejacket Unlike a buoyancy aid, a lifejacket will keep a
person fully afloat with their head clear of the water
Longitude Imaginary lines running round the globe from north
to south, like segments of an orange. Used with
lines of latitude to measure position and distance
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