Rank | Abbreviation | Meaning |
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***** | DEAD RECKONING. | In navigation, a way of calculating a ship's or plane's position without reference to sun or stars, based on speed, direction, and drift.
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***** | THUMB DEAD BOLT. | A type of single cylinder lock often used in hotels. A door locked with such a lock can be opened from the inside by hand (or “thumb”) rather than a key, offering a quick exit in case of emergency
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*** | DEAD AHEAD. | Straight in front of the ship's bow.
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*** | DEAD BOLT. | A type of door lock often used in hotels that, when locked, extends a heavy metal projection (or bolt) into the door jamb. See also thumb dead bolt.
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*** | DEAD CALM. | No wind. Zero on the Beaufort scale.
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