Penny S: the ship you saw was the M.V. Mi Amigo that transmitted as Radio Caroline South, Radio Caroline (North) broadcast on 259m MW from Douglas Bay (I think) off the coast of the Isle of Man in international waters. All went well until the labour government of the day introduced the Marine Offences Bill which effectively closed down the off-shore stations. The Post Master General whose department was responsible for enforcement was later involved in some scandal. I can't remeber his name , John something or other I think. Whilst the other stations closed, the M.V. Mi Amigo moved 'up north' and began transmitting as Radio Caroline (not 'North'!). The transmitter originally had a power of 10kw, but I believe the newer station ran 40kw which ensured far better coverage. Happy days! John