The determination of the position of the Titanic for the initial distress call after hitting an iceberg (S23) has validity time-span the time of the collision (E52). [This is a plausible guess based on Boxhall’s account; the collision was on 14 April 1912 23:40 ship’s time.] (Halpern, 2011, Boxhall, 1962)
The determination of the position of the Titanic by officer Joseph G. Boxhall after the initial distress signal was sent (S23) has validity time-span the time of the collision (E52). [Boxhall was convinced of the correctness of his position determination until his death.] (Halpern 2011, Boxhall, 1962)
The determination of the position of the Titanic by Robert Ballard's team after the Titanic ship-wreck was found (S23) has validity time-span the time of the position determination (E52). [This time period falls within the 1 st of September 1985 00:48, i.e. the first encounter of a piece of Titanic debris and 1987] (Ballard et al., 1987)
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