The sources of the information in your list from 1 to 5 is entirely based on what survivors However, it is not complete. My list looks like the following. I have included sources.And here is where things differ, in the assumptions made and the logic used to support those assumptions.
The facts are simple enough:
We all seem to agree,
1. The vessel travelled 1549 miles by noon on the 14th since departing Queenstown.
2. The ship ran 260 miles by log from noon to the time of collision.
3. The ship ran about 45 miles between 8 and 10pm earlier that night.
4. The ship sank at 41° 43.5'N,49° 56.8'W.
5. The CQD positions of Boxhall and Capt. Smith were both too far west of the wreck site, the first about 13 miles and the second about 20 miles.
All else is the application of assumption and logic based on what survivors reported.
1. The vessel travelled 1549 miles by noon on the 14th since departing Queenstown. (Pitman)
2. The vessel slowed down to 20.95 knots for a period between Noon April 14 and 8 pm April 14. (Lowe)
3. The vessel increased her speed to 22 knots after 7-30 pm sights. (Boxhall)
4. The ship ran 260 miles by log from noon to the time of collision. (QM Rowe)
5. The ship ran about 45 miles between 8 and 10pm earlier that night.(QM Hichens)
6. The CQD positions of Boxhall and Capt. Smith were both too far west of the wreck site, the first about 13 miles and the second about 20 miles. (Boxhall and PV Mount Temple).
7. No. 4. The ship sank at 41° 43.5'N,49° 56.8'W." (Discovery of the wreck site).
5th Officer Lowe clearly stated the following in his evidence:
"Senator SMITH.:.. before you could obtain this position, did you first have to ascertain the speed of the ship?
Mr. LOWE: You are speaking of the 8 o'clock position, sir?
Senator SMITH: Yes.
Mr. LOWE: Her speed from noon until we turned the corner was just a fraction under 21 knots.
Senator SMITH: And you are able to say that the speed at that time was 21 knots?
Mr. LOWE: Twenty-one knots or under; it was really 20.95, about. If the speed had been increased or reduced during the interval when I was off duty, I would have been informed of it."
Lowe was was asked the ship's speed and he gave it, therefore it is sworn evidence of ship speed that has to be given proper consideration in exactly the same way as any other sworn evidence.
By the same token, Boxhall was asked what speed he used to calculate his DR distress position. Like Lowe, he gave a speed and qualified his choice because he thought the prevailing conditions would reduce slip, and said so. That too has to be subjected to close scrutiny.
" taking into consideration that it was smooth water and that there ought to have been a minimum of slip, I allowed 22 knots."