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Mackerel sky .... Said of a sky filled with high rounded fleecy or
cirrocumulus clouds.
Cloud Types. Magnetic bearing .... A bearing read off a magnetic compass. Magnetic compass .... A compass, the needle of which is attracted by magnetic north. Magnetic course .... Course after adjustments for deviation and variation have been applied. Magnetic meridian ....Imaginary line of longitude passing through the magnetic poles and cutting the equator at right angles. Magnetic north .... The point to which the north seeking pole of a magnetic compass points. Magnetic variation .... This is the difference, measured in degrees between true north and magnetic north. Main boom .... The spar to which the foot of the main sail is attached. Mainsail .... The sail set on the mainmast. Mainsheet .... The sheet used to control the main sail. Mainsheet block .... A block that redirects the mainsheet to within the helmsman's reach. Mainsheet tackle .... A system of blocks used to give a mechanical advantage when handling the mainsheet. Make fast .... To secure. Malin .... The name given to a sea area situated off the North coast of Ireland. Marconi .... Another name for a Bermudan rig. Mark .... A buoy on a racing course. Mark .... An object that is used as a navigational guide. Marline spike .... A tapered spike used in splicing. Mast .... A pole mounted vertically on a vessel to support the sails. Mast gate .... The place where the mast passes through the foredeck of a dinghy. Masthead .... The top of the mast. Masthead rig .... A rig in which the jib or headsail is set from the top of the mast. Mast spanner .... The means of adjusting the angle of a rotating mast on a catamaran. Mast step .... The recess in the keel into which the base of the mast is fitted. Mast pulpit .... A framework fitted around the base of the mast, in which a crew member may wedge himself for support whilst working. MAYDAY .... The international distress signal, transmitted only in the direst circumstances when there is imminent danger to a vessel or person., and immediate assistance is required. Distress calls. Measured mile .... A pre-measured nautical mile, usually identified on a chart by sets of transits. Used to check the accuracy of a vessel's log. Meltemi .... Sometimes known as the Etesian. A North Westerly wind in the Aegean Sea. Mercator, Gerardus .... The latinized name of the flemish geographer who invented the system of map projection. Mercator projection .... A system of map projection that shows all lines of latitude and longitude as straight lines that cross at right angles. Meridian .... Imaginary line of longitude passing through the true (geographic) north and south poles and cutting the equator at right angles. MHWN .... Mean High Water Neaps, the average height of all neap high tides. MHWS .... Mean High Water Springs, the average height of all spring high tides. Midships .... The middle part of a vessel. Midships spoke .... This is the central upper spoke of a ships wheel, when the rudder is positioned along the centre line of the vessel. Mike .... The letter M in the phonetic alphabet. Phonetic Alphabet. Millibar .... A unit of barometric pressure. Mirror .... A light general purpose dinghy, International class. Miss stays .... When a vessel that is tacking fails to go about it is said to miss stays. Mistral .... A cold northerly wind that blows down the Rhone valley through Southern France and into the Mediterranean. Mizzen .... The sail set on the mizzenmast. Mizzenmast .... The after mast of a ketch or a yawl. Mizzen staysail .... The sail set on the forestay of the mizzenmast. MLWN .... Mean Low Water Neaps, the average height of all the neaps low tides. MLWS .... Mean Low Water Springs, the average height of all the spring low tides. Mono-hull .... A vessel with one hull. Moor .... To tie up a vessel so that it cannot drift free. Mooring .... A fixed object or a system of permanent anchors and chains to which a vessel may be moored. Mooring buoy .... A buoy attached to a permanent anchor used as a mooring for a vessel. Buoyage Morse, Samuel Finley Breese .... The American inventor of Morse code. Morse Code. Morse code .... An alphabet or code in which the letters are represented by a combination of long and short light or sound signals. Morse Code. Moulded hull .... A hull that is formed in a mould using either glass reinforced polyester or bonded layers of veneer. Mud weight .... An weight designed to sink deep into the mud to form either a permanent or temporary anchor. Multi-hull .... A vessel with more than one hull, i.e. Catamaran or Trimaran. Mushroom anchor .... A mushroom shaped anchor that is used as a mud weight forming a permanent mooring. Anchor Types. |