The University of Thessaly and UTH are developing two buoy nodes that can be used to host any sensors/biosensors for in-situ monitoring of quality parameters in marine environments. The overall architecture of the deployment is divided in 2 tiers, the shore-side and the sea-side components. Two buoy nodes floating on the sea surface are used to host sensors and to transmit their measurements to the shore-side components, which are used to control and manage the sea-side deployed buoys, as well as to provide remote access to the entire system. The shore-side components consist of several devices such as a server machine, an Ethernet switch and the Access Points (APs). The server machine runs all the required services for managing the APs and the buoy nodes while it also provides access to remote users (through the existing Internet connection) for the visualization of the data. The APs are connected to the server machine through the Ethernet switch and provide wireless backbone connection to the buoy nodes.