Admiralty List of Radio Signals. British admiralty publications (8 volumes, some of them in double or triple books) informing the navigators about all the radio stations and various kind of broacasted informations such as time signals, weather & navigational warnings, positioning systems, VTS procedures and many other. They are regularly updated through the weekly published Notice to Mariners, but this work is time consuming and the actual small staffs have hardly any time to do it. An affordable electronic publication with online updating is badly needed.