(a) You must carry on your towing vessel both--
(1) The minimum number of hand-portable fire extinguishers required by subpart 25.30 of this part; and
(2) An approved B-V semi-portable fire-extinguishing system to protect the engine room.
(b) You must have a fixed fire-extinguishing system installed to protect the engine room of the vessel.
(c) This section does not apply to any towing vessel pushing a barge ahead, or hauling a barge alongside, when the barge's coastwise or Great Lakes route is restricted (as indicated on its certificate of inspection), so that the barge may operate ``in fair weather only, within 12 miles of shore,'' or with words to that effect.