Elektronika MK-52: The MK-61 big brother?

[MK52]

There is a space flown MK-52 on ebay. Ebay item 272058501564

I assume that the astronavigation ROM mentioned by an earlier post was used for what is called celestial navigation by sailors and others. I.e. using a sextant etc....maybe cosmonauts could use the same celestial navigation programs....if anyone knows it would be great to hear from you.