OVERVIEW: The Decca Radar was a British radar system family widely used in both civilian navigation and military applications. Known for its reliability, it played a major role in maritime safety and airspace surveillance from the post-WWII period through the late 20th century.

GENERAL DESCRIPTION: Decca Radar systems were developed in the UK for both civilian navigation and military applications, offering active radar capabilities for surface detection, collision avoidance, and airspace surveillance. Operating mainly in the S-band and X-band ranges, Decca radars were known for their reliability, ease of integration, and modular design. They served on commercial vessels, naval ships, and fixed installations, supporting navigation and tactical awareness in diverse environments. Over time, they became a key component in NATO-aligned radar infrastructure and were widely exported for global use.

ROLE SUMMARY:
Category: Surface Surveillance / Navigation / Early Warning Radar
Primary Use: Detection and tracking of surface or aerial targets; marine navigation
Function: Active radar emission for situational awareness and safety
Platform: Commercial vessels, naval ships, coastal installations
Export: Widely exported to allied navies and civilian fleets worldwide
Integration: Operable as standalone or with navigation and fire-control systems

SOURCE:
https://en.wikipedia.org/wiki/Decca_Radar
GlobalSecurity.org – Radar Systems Archives