Lokata

Lokata (pronounced low-kay-tah, "locator") is a radar navigation system, which works in the same way as Exocet missile technology. A civilian invented it in Falmouth. It is said to work not by emitting its own radar signal but by listening to other crafts' radar signals, accidentally duplicating one version of the Exocet missile's guidance system. When he tried to patent his invention, the Patent Office ordered him to keep it secret. He refused and went public and started a big public protest in the area about the jobs that would be created in the area making Lokatas.

Unfortunately, there is no evidence to suggest that Exocet used passive homing.
 
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