From The Irish Independent:

The world’s most expensive Titanic artefact has gone on public display in a centre dedicated to the doomed liner. The 32ft-long plan of the ship, which was used as a reference guide during the 1912 British inquiry into the sinking, has been passed to Titanic Belfast by a mystery benefactor. The anonymous collector bought the well-preserved paper diagram at auction for £220,000 last year. It bears ink marks denoting exactly where engineers giving evidence to the Board of Trade inquiry determined the White Star Line vessel had struck the iceberg on its fateful transatlantic maiden voyage in April 1912.

Source: Irish Independent, Ship Plan On Show At Titanic Centre, 27 Nov 2012