This Part applies to
all vessels that are engaged in towing or being towed on a seagoing voyage,
but this Part does not apply to —
(a)
regular towage of cargo on a commercial basis; and
(b) the
harbour towage of vessels; and
(c) the
towage or assistance of oil‑exploration structures,
semi‑submersible oil platforms, and the like, which are
self‑propelled; and
(d) a
vessel in distress at sea or stranded in a position where immediate action by
the towing vessel is vital to the saving of life or property.