| 1898-89 | East Goodwin Lightship | First Marconi tests in the Thames estuary |
| 1898 | Flying Huntress | Marconi sending news flashes from the Kingstown Regatta near Dublin (Ireland) |
| 1989 | Royal Yacht Osbourne | Further Marconi tests at Cowes, Isle of Wight (UK) |
| 1899 | Defiant | Marconi tests off the English coast |
| 1902 | Hartholdi | First voice broadcast from a ship on the Potomac River in Washington, DC |
| 1906 | Missouri (BB 11) | First broadcast of music from a ship moored at Hampton Roads/Virginia (USA) |
| 1907 | Andromeda | Royal Navy Radio in Chatham (England) |
| 1907-09 | The Great White Fleet | Broadcasts to passing ships and to land based communities from 24 transmitters |
| 1910 | Bremen | 1st liner fitted with wireless telephony |
| 1912 | Titanic | Several broadcasts of recorded music on its first and only voyage into the Atlantic |
| 1916 | Unknown vessel | A ship broadcast during the Irish Easter Uprising |
| 1917 | Cruiser Aurora | Lenin speech in St. Petersburg (Russia) |
| 1919 | George Washington | President Wilson making an Independence Day broadcast for the coastal areas of the US |
| 1919 | Riverina | Test broadcasts from the vessel in Australian waters |
| 1919 | Bombala | Test broadcasts from the vessel in Australian waters |
| 1920 | Victorian | Broadcasting brief concerts to passing ships |
| 1920-35 | Elettra | Several Marconi test broadcasts |
| 1922 | Unknown vessel | An experimental demonstration broadcast from the harbor at Copenhagen (Denmark) |
| 1924 | USS Leviathan | Broadcasting several concerts from the Atlantic as "WSN" ("America's first floating broadcaster") |
| 1925 | West Virginia | Several broadcasts directed to Australia |
| 1926 | Carinthia | Relaying a program to 5CL in Adelaide while steaming east towards Melbourne |
| 1927 | Akuna | Relaying a program to 3LO from the waters of Port Philip Bay, Melbourne |
| 1927 | Franconia | Broadcasting music from the ship’s orchestra whilst cruising in the Pacific |
| 1928 | Berengaria | TV trials whilst sailing from Southhampton to New York |
| 1928 | Ceto |
Test transmissions by Daily Mail Radio off the Scottish and English coast Scotland |
| 1930 | Little WLW | Powel Crosley Jr's broadcast from the tarpon tournament in Sarasota/Florida |
| 1930's | Monarch of Bermuda | Occasional broadcasting in the Atlantic off the islands of Bermuda |
| 1931 | Veronica | Relaying messages, voice reports and programs from Hawkes Bay (New Zealand) after an earthquake |
| 1931 | Unknown vessels | Relaying messages, voice reports and programs from Hawkes Bay (New Zealand) after an earthquake |
| 1932 | Nieuw Holland | Relaying a program to 2UW while leaving Sydney Harbour |
| 1932 | Empress of Britain II | Several broadcasts in the South Pacific |
| 1932-38 | Normandie | Music broadcasts during its voyages across the Atlantic |
| 1933 | Freedom | Relaying a scientific broadcast from the underwater vessel Bathysphere off Nonsuch Island (Bermudas) |
| 1933 | City of Panama | Broadcasting programming from a gambling ship off the coast of Los Angeles as RXXR |
| 1933 | Jacob Ruppert | Byrd Antarctic Expedition II ("Station KJTY") on its way from Panama Canal to New Zealand and Little America |
| 1934 | New Zealand Star | Live broadcast of launch in Belfast |
| 1934-35 | Seth Parker | Several broadcasts during a geographic expedition in the South Pacific |
| 1935 | Unknown vessel |
Radio Morue accompanying French cod fishermen to i.e. Newfoundland |
| 1936 | Queen Mary | Broadcasts while plying the Atlantic |
| 1936-39 | Kanimbla | Broadcasting in the South Pacific as VK9MI ("Radio 9MI") |
| 1936-39 | Awatea | Broadcasting in the Tasman Sea as ZMBJ |
| 1937 | Mariposa | The Italian tenor Tito Schipa wirh a live broadcast to New Zealand |
| 1938 | Faithful Friend | Sender der Deutschen Freiheitspartei with anti-Nazi broadcasts off the French, Belgian and Dutch coast |
| 1938 | Rex | Broadcasting programming from a gambling ship off the coast of Los Angeles |
| 1939 | Dominion Monarch | Broadcast while on its maiden voyage from New Zealand to London in 1939 |
| 1940 | Director II | Broadcasting from the South Pacific to the US during the second Fahnestock expedition |
| 1940 | Hansestadt Danzig | Pretending to be Radio Copenhagen (Denmark) from the local harbour |
| Early 1940's | [Kron Prinz] | Floating broadcaster fitted out in the Caribbean (probably ill-fated project) |
| 1940 | [Hamilton] | Ill-fated project for the South Seas |
| 1941 | Lurline | Relaying a program to KRO in Hawaii as station KIEK |
| 1941 | Unknown vessel |
"Estacion Piranaica" with anti-Franco broadcasts from a Soviet trawler in Baltic Sea |
| 1942 | Texas | Broadcasting "Voice of America" programs from the Mediterranean |
| 1944-46 | Apache | A communication ship with radio programs from the Pacific (relaying AFRS and the VoA as WVLC) |
| 1944 | Nashville | Broadcasting the famous "I Have Returned" broadcast by General MacArthur in the Philippines |
| 1944-45 | FP47 | A subordinate radio ship sending war news and despatches to the Apache in the Pacific |
| 1945 | Missouri (BB 63) | Broadcasting the surrender ceremony from Tokyo Bay |
| 1945 | Iowa | Broadcasting the surrender ceremony from Tokyo Bay |
| 1945-1950's | Phoenix | Broadcasting "Voice of America - China" programs from the China Sea |
| 1946 | Grenville | The British fleet In the South Pacific broadcasting as "Radio Grenville" |
| 1946 | Unknown vessel | The British fleet In the South Pacific broadcasting as "Radio Romance" |
| 1946 | Unknown vessel | The British fleet In the South Pacific broadcasting as "Schooldame" |
| 1946 | Spindle Eye | A special Army Communications ship broadcasting from the Bikini Atoll ("Operation Crosswards") |
| 1946 | Appalachian | Broadcasting from the Bikini Atoll ("Operation Crosswards") |
| 1946 | Mt McKinley | Broadcasting from the Bikini Atoll ("Operation Crosswards") |
| 1946-47 | Mount Olympus | Radio broadcasts on the way to Little America (Antarctica) during "Operation Highjump" |
| 1947 | Orion | Broadcasting to maritime station VIM in Melbourne with the callsign GYLK |
| 1947 | Hinemoa | Radio communications in the South Pacific as ZMFQ with a 500 watt transmitter (unconfirmed) |
| 1950-53 | Unknown vessel |
Radio Euzkadi (anti-Franco broadcasts) from Bayonne harbour (France) |