Ocean Surveillance Information System (OSIS)

The Ocean Surveillance Information System (OSIS) was a US Navy Cold War network that fused intelligence and surveillance reporting to track the location and movement of foreign naval and merchant ships across the world’s oceans. Its fusion centers correlated inputs from signals intelligence, ocean acoustic surveillance, reconnaissance, and reporting to maintain a maritime picture supporting fleet and theater commanders. OSIS supported over-the-horizon targeting by cueing long-range anti-ship engagements against contacts beyond a ship’s own radar horizon. It later evolved into broader maritime surveillance and fusion architectures.