Challenge accepted! 😁

This is my (current) take on procedural dungeon generation. Forever a "work in progress" it seems (haven't touched it in a long time). I've had so much fun creating it, perhaps someone else has fun using it:

I also keep a hand-curated list of generators (which hasn't been updated in ages) here: http://rpg20.com/about.php#dungeon

Yup. I like it.

That's so wholesome. :)

Hi Egavactip, and welcome!

I still consider myself fairly new to CC3+ and Cosmographer, so maybe someone else will point out errors or misconceptions of my own.

There is a guide, thought I can't tell if you haven't found it yet or if you find it too short to answer your questions. In case it's the former, you should find it in the Documentation folder in your Program Data folder. In my case it's at:

"C:\ProgramData\Profantasy\CC3Plus\Documentation\Cos3EssentialsGuide.pdf"

Moving on to your main question, I do believe the "Traveller Sector Import" wizard currently only works by fetching data from travellermap.com, as explained in a sidebar on page 18 of the guide:

If you want to place all symbols yourself (manually) you can still use the templates named "Cosmographer Sector Vector" or "Cosmographer Sector Bitmap".

But, if you want to skip all of the tedium of placing everything by hand, I'll yield to see if someone else knows if it's possible. I vaguely recall someone mentioning what it would take, but a quick search didn't yield anything resembling that idea on the back of my mind. And since I'm also fairly new to Traveller, I haven't delved into custom sector building.

Finally...

In what format do you have this data?

EDIT: Regarding this question:

I found this two year old comment from JimP:

To be fair, most of the maps I've used in games are not made by me. But I have been trying to keep doing something in CC3+ as often as I can.