(m) co-ordinate measures and co-operate in the maintenance of the high security required in respect of air services operations and operate joint search and rescue operations. ARTICLE 93 Maritime Transport and Ports The Partner States shall: (a) promote the co-ordination and harmonisation of their maritime transport policies and establish a common maritime transport policy; (b) promote the development of efficient and profitable sea port services through the liberalisation and commercialisation of port operations; (c) make rational use of existing port installations; (d) in the case of the coastal Partner States, co-operate with the landlocked Partner States and grant them easy access to port facilities and opportunities to participate in provision of port and maritime services; (e) take measures to ratify or accede to international conventions on maritime transport; (f) establish a harmonious traffic organisation system for the optimal use of maritime transport services; (g) co-operate in the elaboration and application of measures to facilitate the arrival, stay and departure of vessels; (h) promote co-operation among their port authorities in the management and operations of their ports and maritime transport so as to facilitate the efficient movement of traffic between their territories; (i) agree to charge non-discriminatory tariffs in respect of goods from their territories and goods from other Partner States, except where their goods enjoy domestic transport subsidies, and apply the same rules and regulations in respect of maritime transport among themselves without discrimination; 68