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A comment on SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by tracking the stars. Parent comment

Re:SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by... by singleshot_ on Monday September 25, 2023 @06:21PM (#37651517)
Come on, everyone knows what the DEF-H was. It was the replacement for the DEF-F.

(The real question being, of course, what is the DEF-G?)

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Re:SR-71 Blackbird Astro-Nav System (a.k.a. R2-D2) worked by... by mattkrause on Monday September 25, 2023 @08:42PM (#37652840)
You’re joking, but it’s predecessor was actually DEF-F.

There aren’t many details but it’s some kind of electronic countermeasures/data collection system.

See the museum exhibit here:

http://www.sr71.us/sr_sensors_pg3.htm

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