Paragraph 27
The master of a vessel which has slipped or parted from or lost any anchor, chain, cable or propeller shall—
(a)
as soon as reasonably practicable give to the harbour master notice thereof and, if possible, of the position of the anchor, chain, cable or propeller and, if the harbour master so directs, shall cause it to be recovered as soon as reasonably practicable;
(b)
in the case of an anchor or propeller, leave a buoy to mark the position thereof if this is known.