A method of data exchange, by radio data communication equipment operating (8; 9) as a User Equipment, UE, applied on a nautical beacon (4; 5), for accessing Wide Area Network, WAN, radio access resources provided by WAN radio data communication equipment (6; 7) operating as a radio base station, RBS, applied on a nautical vessel (2; 3), said method comprising: - receiving , by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), from WAN radio data communication equipment (6; 7) applied on a nautical vessel , an indication of availability of WAN radio access resources; - receiving , by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), from an operating position detection device of said nautical beacon (4; 5), an indication that said nautical beacon (4; 5) is in an operating position for establishing a radio communication link based on an altitude of the nautical beacon, and - establishing , by said radio data communication equipment applied (8; 9) on said nautical beacon , a radio data communication link (28, 30; 29, 31) with said WAN radio data communication equipment (6; 7) of said nautical vessel (2; 3) based on said WAN radio access resources wherein said method further comprises: - keeping, for a predetermined first period of time, by said radio data communication equipment (8; 9) applied on said nautical beacon(4; 5), a list of identifications of WAN radio data communication equipment (6; 7) applied on nautical vessels (2; 3) available for radio data communication; - disconnecting, by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), a radio data communication link with said WAN radio data communication equipment applied on said nautical vessel , after a predetermined second period of time, and - establishing, by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), on a Round Robin basis according to said list of identifications, a respective radio data communication link with said WAN radio data communication equipment applied on at least one further nautical vessel . - receiving , by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), from WAN radio data communication equipment (6; 7) applied on a nautical vessel , an indication of availability of WAN radio access resources; - receiving , by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), from an operating position detection device of said nautical beacon (4; 5), an indication that said nautical beacon (4; 5) is in an operating position for establishing a radio communication link based on an altitude of the nautical beacon, and - establishing , by said radio data communication equipment applied (8; 9) on said nautical beacon , a radio data communication link (28, 30; 29, 31) with said WAN radio data communication equipment (6; 7) of said nautical vessel (2; 3) based on said WAN radio access resources - keeping, for a predetermined first period of time, by said radio data communication equipment (8; 9) applied on said nautical beacon(4; 5), a list of identifications of WAN radio data communication equipment (6; 7) applied on nautical vessels (2; 3) available for radio data communication; - disconnecting, by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), a radio data communication link with said WAN radio data communication equipment applied on said nautical vessel , after a predetermined second period of time, and - establishing, by said radio data communication equipment (8; 9) applied on said nautical beacon (4; 5), on a Round Robin basis according to said list of identifications, a respective radio data communication link with said WAN radio data communication equipment applied on at least one further nautical vessel . <EOS>