Maul. Heavy hammer of iron or wood. Mayday
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Heavy hammer of iron or wood.
(French 'm' aidez', 'Help me'.) The international spoken radiotelephony signal of distress.
Greatest angular distance above horizon.
Double-bottom construction involving the cutting of frames and reverse frames and the fitting of a continuous water-tight angle bar to take lower edge of tank margin plate.
Water-ballast tank seated on top of ordinary floors. Preceded double-bottom tank.
Meade Great Circle Diagram.
Graticule for solving great circle sailing problems from projection of course on a Mercator chart.
Half sum of forward and after draughts of a vessel. It differs slightly from draught at half length.
Mean High Water.
Mean of all high waters at a place when observed during a lunation of 29 days.
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