GCA stands for "Ground Control Approach". It refers to the radar and the Air Traffic Controllers that use it to guide aircraft to a landing at an airport. The radar that I worked on had enough resolution that you could see the individual lights at the edge of the runway as two parallel rows of dots:

Some Air Traffic Controllers in Germany used to say that GCA really stood for "God's Chosen Airmen" but some of the more cynical or sarcastic pilots claimed that it really meant "Gonna Crash Anyway" which amused some of the Air Traffic Controllers and annoyed some of them severely.

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