The ship was constructed by Harland & Wolff, in Belfast and launched on 22 May 1915, she was completed in June 1915.

During World War I, the monitor served in the Mediterranean Sea at the Battle of Jaffa in 1917 and took part in operations in support of British and White Russian forces in the White Sea during the Russian Civil War in 1919.

Again renamed HMS Medway II in February 1944, she became the depot ship for the 1st Submarine Flotilla.

Resold circa 1950 to Spyros Theodoratos, Greece and registered on January 21, 1951, at Lavrion (Nr.

On 16 November 1971 Gerogeogakis was intercepted off Cavallo Island, Corse, with a cargo of 12 tons of smuggled cigarettes.