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
Lower Furling Unit The fitting at the bottom of the forestay that
enables the jib to be furled
Luff The front edge of the sail
M
Mainsail The largest sail on a boat
Mainsail Clew Slug The fitting that sits in the track on the boom, to
which the clew of the mainsail is attached
Mainsheet The rope used to control the mainsail
Mainsheet Bridle The rope runs across the transom of the boat, to
which the mainsheet is attached
Mainsheet Centre Block The main block, usually fixed to the cockpit floor,
through which the mainsheet passes
Man Overboard Recovery The act of recovering a ‘man overboard’ from
the water
Mast The spar that the sails are hoisted up
Mast Foot The bottom of the mast
Mast Gate Fitting which closes across the front of the mast at
deck level, holding the mast in place
Mast Lower Section The bottom section of a two-piece mast
Mast Step The fitting on the deck that the mast fits into
Mast Top Section The top section of a two-piece mast
Meteorology The study of weather forecasting
Moor To tie the boat to a fixed object
Mylar A brand of strong, thin, polyester film used to make
racing sails
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