Allied motor boats patrolling in Gulf of Naples according to the Kriegsnachrichten No. 60 of the Chef des Admiralstabes der Marine dated 28 June 1918

An item referring to a reliable agent reported that in the Gulf of Naples between the islands Ischia and Capri a regular guard service by motor boats was established. More as 10 motor boats were sighted.

Source

Bundesarchiv RM-40-622