The term gun deck used to refer to a deck aboard a ship that was primarily used for the mounting of cannon to be fired in broadsides. The term is generally applied to decks enclosed under a roof; smaller and unrated vessels carried their guns on the upper deck, forecastle and quarterdeck, and these were not described as gun decks.
The term "gun deck" is also navy slang for fabricating or falsifying something. A possible explanation relates to midshipmen retiring to the gun deck to complete their celestial navigation assignments of computing the ship's position three times daily following morning star sights, noon sun line, and evening star sights. While some midshipmen might be conscientious about computing positions from new observations, others were reputed to extrapolate and back calculate observation data from dead reckoning courses and speeds since earlier observations, and the computations performed on the gun deck were suspect.
This term is now used to indicate the falsification of documentation in order to avoid doing the work or make present conditions seem otherwise acceptable.
- Knight, Austin M. Modern Seamanship Tenth Edition (1941) D. Van Nostrand Company p.798
- "Streamer Handling Apparatus For Use On Seismic Survey Vessels - Patent 6382124". Archived from the original on 2014-11-09. Retrieved 2012-01-25.
- "Origin of Navy Terminology". United States Navy. Retrieved 2011-02-04.
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