Rostron was fully aware of what was asked of him. He also knew that NY was carrying time for the 75th meridian west longitude, and did so since the early 1880s. That table shows LMT for the ambrose lightship, not the time carried on clocks in New York, Boston, or any other location on the east coast of the US and Canada. That table you show is practically useless.

Now as far as where Carpathia would have been at LAN on April 15th, her DR position for when she turned around was at 49° 13'W. This was based on working the given evidence that Carpathia was calculated by Rostron to be 58 miles and bearing S52°E true from the SOS position which was 41° 46'N, 50° 14'W. Apparent time on Carpathia was 12:35am, a time that would have be such that when her clocks reached 12:00pm some 11 hours 25 minutes later, it would have corresponded to local apparent noon. At a reported speed of 14 knots, Carpathia would have covered a distance of about 160 miles. She was heading eastward on the GC to Gibraltar. Down in latitude 41° 10'N, each mile eastward is loss of 1.33' in longitude, or 160*1.33 = 212' = 3° 32' from 49° 13'W yielding a longitude for LAN at:

45° 41'W. LAN at 45° 41'W on 15 April came at 15:03 GMT, which means Carpathia clocks were set at midnight for 3 hours 3 minutes behind GMT.

If she had not turned around for SOS position when she did, she would have discovered that she was running ahead of the DR when a longitude site of the sun would be taken in the forenoon, and any correction to the time would be done at that time. If you work the same problem assuming a speed 15.5 knots, then LAN would have been at 45° 17'W, and clocks adjusted to be 3h 01m behind GMT.

No, Sam, these Tables are not as you declare "totally useless". Otherwise, why was that it was included in every one of the eleven additions printed right up to 1947? Would that be because navigators used GMT Chronometers and not ship time or EST?

As for

*Carpathia's* run to LAN 15th? A ship's run was calculated GMT to GMT. The times were taken from the chronometer, not Apparent Time Ship or local time New York. They were the actual hours and minutes on passage from A to B.

When

*Carpathia *arrived at New York or departed New York, the arrival and departure times would be recorded as per chronometer and EST. However, the chronometer did not show EST + 5 hours, but EST + 4 hours 55 minutes. The 5 minutes added on arrival were not part of the day's run. Nor would they be part of the day's run from the time of departure.

Applying the foregoing:

From Faop at 2 pm EST, on the 11th to first receipt of the CQD at 10-35 pm EST on the 14th is run time of

**80 hrs 35 minutes.**
From Faop at 18- 55 GMT 11th to CQD at 3-35 am GMT 15th is a run time of 80 hours 40 minutes.

Now consider the run times without any clock alterations...i.e. from 2 pm 11th to 12-25 am April 15. That is a total run time of 82 hours 25 minutes. Subtract the true run time and you get the amount of clock change applied between Faop and the moment the distress signal was received on

* Carpathia*. But what is the true run time? Remember that 5 minutes was added without the ship moving an inch during these minutes.

EST is an arbitrary time. However, chronometer time... GMT was the benchmark.

If you subtract run time EST to EST, you get a difference of 1 hour 50 minutes. If you subtract GMT from GMT you get a difference of 1 hour 55 minutes. It follows that when the distress signal was received, the difference between ship time EST and New York EST was exactly 1 hour 50 minutes. So Rostron said it as it was.

If

*Carpathia *was at or near to 49-13W at 12-30 am, then, since the clocks were advanced by about half an hour before midnight, it had taken about 12 hours to get there from Noon the previous day, April 14.

She must have been reducing her westerly longitude between 18.5 and 20 minutes per hour. If so, then in 12 hours she had reduced it by a maximum 4 degrees of longitude, meaning that at Noon April 14, she would have been near to 53-13'West at Noon on April 14. At that time, her clocks would have been adjusted to being 1 hour 27 minutes FAST of New York EST. Rostron would then decide how much to alter them for the next day's run. This would depend on his average speed during the previous Day's run.

Apart from the foregoing, this is about

*Mount Temple*, do you still believe she was unaffected by the Gulf Stream?