Offshore radio acquired the yacht Ceto and installed radio equipment. Unfortunately, the apparatus could not operate properly overboard, the signal being heavily affected by the climate conditions. The transmitter was then replaced by Siemens loudspeakers and the Ceto toured England "broadcasting" gramophone records interspersed by advertising. Unauthorized offshore broadcasting stations operating from ships or fixed platforms in the coastal waters of the Northern Sea first appeared in 1958. There were as many as eleven such stations in the mid-1960s. One of the most popular offshore radio broadcasts in Europe came from Radio Caroline, which developed out both of the strict broadcasting regulations
Radio Mercur ship. It broadcast to the southern province of Sweden, Skåne and was run by a young man, Nils-Eric Svensson, who had studied radio and TV in USA and had worked at the government run Swedish Radio for a very short time Radio Mercur was probably the first commercial offshore radio station in the world and gave inspiration to a whole number of offshore radios or pirate radios in Sweden, Netherlands, Belgium and United Kingdom during the 1960s. The Danish press soon began to use the expression "pirate radio" on Radio Mercur, and a number of cartoons in newspapers and magazines