sentences:  The crystal, which was about the size of a matchbox, had been used as a replacement pawn for the ship's chessboard, and had apparently been thrown overboard when the chess set was replaced.Consequently, when Radio Atlantis launched it was on "Mi Amigo"s 50 kilowatt transmitter, on Caroline's main frequency of 1187 kHz (253 m), although all of the DJ announcements originally gave the wavelength as 385.It has been claimed that Atlantis was the only offshore radio station ever to launch on its announced date, even though it was on the wrong frequency.