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A comment on Back-ups for GPS: Satellite-navigation systems at risk of jamming. Parent comment

Re:Back-ups for GPS: Satellite-navigation systems at risk of... by numpad0 on Tuesday May 11, 2021 @01:09PM (#27120604)
I couldn't find the picture so spoke from memory and the details were quite wrong, but looks like "canopus sensor"[1] on Mariner spacecrafts was what I had in mind.

1: http://petermasek.50megs.com/starplot.jpg (mirror: https://images.app.goo.gl/9xAn7ATPMSKYLEHs8)

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