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dead reckoning (n.)[dead reckoning 词源字典]: "ascertaining the position of a ship by measurement of the distance run," 1610s, might be from nautical abbreviation ded. ("deduced") in log books, but it also fits dead (adj.) in the sense of "unrelieved, absolute."[dead reckoning etymology, dead reckoning origin, 英语词源]
fudge (v.): "put together clumsily or dishonestly," by 1771 (perhaps from 17c.); perhaps an alteration of fadge "make suit, fit" (1570s), a verb of unknown origin. The verb fudge later had an especial association with sailors and log books. The traditional story of the origin of the interjection fudge "lies! nonsense!" (1766; see fudge (n.2)) traces it to a sailor's retort to anything considered lies or nonsense, from Captain Fudge, "who always brought home his owners a good cargo of lies" [Isaac Disraeli, 1791, citing a pamphlet from 1700]. It seems there really was a late 17c. Captain Fudge, called "Lying Fudge," and perhaps his name reinforced this form of fadge in the sense of "contrive without the necessary materials." The surname is from Fuche, a pet form of the masc. proper name Fulcher, from Germanic and meaning literally "people-army."