Marios Vodas
University of Piraeus, Department of Informatics, 80, M. Karaoli & A. Dimitriou Str, 18534 Piraeus, Greece.

Nikos Pelekis
University of Piraeus, Department of Statistics and Insurance Science, 80, M. Karaoli & A. Dimitriou Str, 18534 Piraeus, Greece.

Yannis Theodoridis
University of Piraeus, Department of Informatics, 80, M. Karaoli & A. Dimitriou Str, 18534 Piraeus, Greece.

Cyril Ray
IRENav – Naval Academy Research Lab, BCRM de Brest, CC 600 - Lanveoc, F-29240 BREST Cedex 9, France.

Vangelis Karkaletsis
Institute of Informatics and Telecommunications, NCSR "Demokritos", Agia Paraskevi Attikis, P.O.Box 60228, 15310 Athens, Greece.

Sergios Petridis
Institute of Informatics and Telecommunications, NCSR "Demokritos", Agia Paraskevi Attikis, P.O.Box 60228, 15310 Athens, Greece.

Anastasia Miliou
Archipelago – Institute of Marine Conservation, Pythagorio, P.O. Box 42, 83103 Samos, Greece.