Nigeria has installed eight automated, camera-equipped surveillance towers in its waters to tackle a surge in pirate attacks.
Chief of Naval Staff Vice Admiral Dele Ezeoba told journalists that the equipment, most of it from Japan's Furuno and costing roughly $12m in total, had high-frequency radio and long-range cameras able to spot ships up to 30 miles away.
The data the towers collect is beamed to a central naval intelligence room and then checked against ships' registration, flag and other information, Ezeoba said in Yenagoa, a part of the Niger Delta plagued by criminal gangs.
"From the domain awareness centre we can see ships from anywhere in the world coming or leaving our maritime space," he said. "It also gives you ability to ... ascertain the actual threat the vessel poses."
Pirate attacks off Nigeria have jumped by a third this year as ships passing through West Africa's Gulf of Guinea, a major commodities route, have come under threat from gangs seeking to snatch cargoes or hold crews for ransom.
In particular, oil theft in the Niger Delta has seen a relentless rise, although analysts say this has only been possible because of collusion by the security forces.
Four of the towers are in Lagos, one each at the Bonny and Brass crude export terminals, one in Yenagoa and one in Ibaka, in eastern Akwa Ibom state, but Ezeoba added that Nigeria still needed to work on its capacity to pursue pirates and other criminal gangs.
Nigeria's navy has had two successes against pirates this year – it captured four off the coast of the main commercial hub of Lagos in mid-August and said it killed 12 pirates in a shootout a week earlier.
But it has had little luck stemming this lucrative enterprise, which remains on the rise and has driven up insurance costs. Unlike the waters off Somalia on the east African coast, where boats now have armed guards on board, there is scant protection for the many ships which anchor off West Africa.