In rule “Personal Belongings” change the last two paragraphs to:

Some seemingly outlandish Items may have a more mundane explanation, on closer inspection. If the Captain feels that an Uncertain Item is particularly improbable, he may remove it and reduce its holder’s Sanity by 1.
Survivors may transfer one not Uncertain Item from their own Possession to the Possession of any other Survivor, but as the result of this action no Survivivor’s number of Items may exceed (3 + the number of Items owned by the Survivor(s) with least Items).

If it exists, repeal rule Salvaging.
Then create a new sub rule called “Salvaging!” under “Personal Belongings”:

On http://www.bbc.co.uk/ahistoryoftheworld/exploreraltflash/?tag=&timeregion=16 there is a list of object names, that is not part of the gamestate for technical reasons, but that Survivors should abstain from changing. This list is known as the Floating Rubbish. The names are divided in at least 19 numbered pages, 2 columns per page (left=1 right=2) and at most 25 rows per page (Ordered from the top to the bottom), so that every name may be identified bijectively by its column, row and page numbers. Whenever for any reason said website does not match this description, it’s not the Floating Rubbish.
As a weekly action, any Survivor may Attempt to Salvage an Item from the sea. To do so, they shall roll DICE3. On 1, they find nothing and their Attempt has no other effect. On 2 or 3, they find something. If so, they shall then roll DICE19 (page), DICE2 (column), DICE25 (row) to get the coordinates in the Floating Rubbish of the name of the Item they found. They shall then add to their possessions that Item with an Uncertain and a Damp Flag. (they may make minor changes to the form of the name if they write the original name in the GNDT comment field).
If for any reason related to the status or existence of the Floating Rubbish web page the identification of exactly one found Item was not possible, they would get nothing instead.