The OAEx joint research programme aims at developing synergies and reinforcing collaboration between the EU, Brazil and Canada in the field of ocean acoustic monitoring and marine technologies. In this context the OAEx programme will be a contribute towards a global ocean. In particular, in the exchange of experience on the usage of ocean acoustics for geophysical exploration, ocean circulation monitoring and underwater acoustic communications. The OAEx programme allows the transfer of knowledge and information between partners in order to improve and complement their individual expertises to be applied in ongoing and perspective projects. More specifically, European and Canadian groups have developed techniques on ocean environmental monitoring by acoustic sensing and/or using underwater acoustic communications, that could be integrated and applied to monitor the challenging and strategic site of Cabo Frio in Brazil, long time studied by the Brazilian partners using conventional oceanographic tools. In turn the Brazilian partners will profit from the programme by acquiring expertises in a prospective field that they are just starting. Moreover, the Canadian partner has privileged access to the NEPTUNE observatory, at the moment an unique cabled long term multidisciplinary ocean observation laboratory operating in the global ocean. Since there are plans for creating such a complex and expensive infrastructures by other major world players, and in particular EU (ESONET network), the OAEx partners will profit from exchanging experiences in order to optimize the exploration and implementation of current and future laboratories. In order to achieve the proposed goals, the main events to be overseen in the OAEx are workshops, a sea trial and data analysis. The exchange will encompass both scientific and technical personnel with experience at sea as well as advanced methodologies for data analysis.