In May 1870, he transferred, again as second in command, to , flagship of the China Station. It was whilst he was on "Ocean" that he wrote an eight-page memoir: "Naval Tactics", which Captain J. G. Goodenough had printed for private circulation. He installed a system of electrical firing so that all guns could be fired simultaneously, making "Ocean" the first vessel to be so equipped. Fisher noted in his letters that he greatly missed his wife, but also missed his work on torpedoes and the access to important people possible with a posting in England.