Section 2(2) in The Merchant shipping (Radio Direction Finders) Rules, 1968.
(2)"existing installation" means"(a)an installation wholly installed on board a ship before the 26th May 1965; and(b)an installation part of which was installed on board a ship before the 26th May 1965 and the rest of which consists either of parts Installed in replacement of identical part or parts which comply with the requirements of these rules;
