Paragraph 6
(1)
Subject to sub-paragraph (2), the master of a vessel must not—
(a)
make fast the vessel to, or
(b)
knowingly cause or permit the vessel to lie against,
any buoy, beacon or mark used for navigational purposes.
(2)
Sub-paragraph (1) does not apply to vessels used for the purposes of—
(a)
erecting or placing,
(b)
altering,
(c)
discontinuing, or
(d)
removing,
aids to navigation in, or in any place immediately adjacent to, the estuary in accordance with the authority given by the harbour master.