4.—(1) Within territorial waters these Regulations shall apply to and in relation to—
(a)any offshore installation and any activity on it;
(b)any activity, including diving operations, in connection with an offshore installation, or any activity which is immediately preparatory thereto, whether carried on from the installation itself, on or from a vessel or in any other manner, other than—
(i)transporting, towing or navigating the installation; and
(ii)any activity on or from a vessel being used as a stand-by vessel;
(c)diving operations involving the survey and preparation of the sea bed for an offshore installation;
(d)subject to sub-paragraph (e), a well and any activity in connection with it and an activity which is immediately preparatory to any such activity;
(e)sub-paragraph (d) includes keeping a vessel on station for the purpose of working on a well but otherwise does not include navigation or an activity connected with navigation; and
(f)(i)any pipeline;
(ii)any pipeline works;
(iii)the following activities in connection with pipeline works—
(aa)the loading, unloading, fuelling or provisioning of a vessel;
(bb)the loading, unloading, fuelling, repair and maintenance of an aircraft on a vessel,
being in either case a vessel which is engaged in pipeline works.
(2) Regulations 6 to 21 shall not apply in relation to an offshore installation which is in transit to or from a location; and an offshore installation is not in transit to or from a location while it is being manoeuvred at the location.
(3) Save where otherwise expressly provided, nothing in regulations 6 to 13 or 15 to 18 shall impose a duty in relation to an offshore installation while there are no persons aboard.