On Keeping the Log of a Ship - the search for the wreck of Shackleton's ship Endurance

Shackleton's cabin - The Endurance

The Report of Mr. Duffus Hardy, Assistant Keeper at the Tower of  log books  on deposit at Somerset House, October 11, 1847 shows the importance of 
The Ship's Log (Admiralty Records No 12).
Frank Worsley in his workbook and captain's log kept meticulous records of the doomed voyage of the Endurance.  Using them teams are competing to find the wreckage in 10,00 feet of water in the Weddell Sea.  The Daily Mail reports.