The Zanzibar System Navy was the naval force of the Caliphate of Zanzibar. It was also called the Caliphate Navy (in 1905 PD) and the Zanzibaran Navy (in 1913 PD). Until 1913 PD, the ZSN was essentially still a sublight self-defense force which required a substantial Manticoran picket for backup. The ZNS did not have anything bigger than a heavy cruiser, and its units were probably assigned almost exclusively to the defense of their own home system. (HH8)