GASCIARINO., G.'. TAN, T.A.? 
'Mercator Ocean International; ?SCALIAN 
INTRODUCTIO:” 
The Copernicus Marine Service is an integrated system of 
systems. From a user perspective, it all starts at the 
Production Units (PU) level. They are producing, then 
sending data to the Dissemination Units (DU). There, 
-egistered users can download those data directly from 
their preferred interfaces. Unknowingly, they are using the 
Central Authentication Services (CAS) of an additional 
logical block: the Central Information System (CIS) (Figure 
1). In addition to those authentication services, the CIS also 
delivers two web portals (to allow new users to register, 
discover, view and download all available data) and a 
metadata catalogue for machine-to-machine interfaces 
Being at the core of the service, the CIS main missions are to 
provide very high availability components and be flexible 
enough to adapt to user’s needs and changes in the products 
offer. The CIS was first implemented during the various 
MyQOcean precursor services and had strong track records 
zoncerning its availlability. Since, it has not been significantly 
updated during MyOcean, the main challenges for the 
Copernicus Marine Service were to make this historica 
system evolve toward state-of-the-art technologies and 
systems, and make it fulfill emergent needs. 
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„zure 1: Simplified general architecture nf the Copernicus Marine System