I ran into an interesting glitch in the Galmap the other day.
I'm currently out in the boonies with mostly undiscovered systems around me, but I noticed that the Galmap was offering to sell me the exploration data for a nearby system or two. Hmm. I figured that they must be discovered systems, then, so I bopped over to one to see (without buying the data).
It was an undiscovered system. How strange. I went back to my carrier but the Galmap no longer offered to sell me the data. I wondered what would have happened if I had bought the data.
Today, again, I noticed that I could buy the exploration data for a different nearby system, and this time I bought the data. The sale succeeded, and I was then able to view the system map. But in this case, the system actually was fully discovered by someone else.
It's a bit of a head scratcher. I guess it kinda makes sense if the system is already discovered, but the first one was not. I still don't know what would have happened there if I bought the data.
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