I did wonder what it was about naval gunners that made them more prone to falsifying records but looks like it is related to midshipmen working out celestial sights: From here: https://www.history.navy.mil/research/library/online-reading-room/title-list-alphabetically/o/origin-navy-terminology.html…

Term: Gundecked / Gundecking

Capt_Phoenix November 11, 2020, 5:53pm 2

That’s the US Navy version of “pencil-whipped”.

Topic		Replies	Views
Ship Nomenclature Professional Mariner Forum	95	6893	August 12, 2020
Garbled: Nautical Terminology Professional Mariner Forum	35	4869	September 12, 2013
FITZGERALD Officer of the Deck Pleads Guilty At Court-Martial Professional Mariner Forum	65	5824	May 17, 2018
Greenhorn Jokes - The Master List Scuttlebutt	24	22795	September 17, 2009
Cult of the Quaint Professional Mariner Forum	40	3515	August 15, 2016