My main base/settlement is Gurjaras I4, in the settlement of New Mogadishu. Nearby, I know there is an Archive Exchange Vault and a Holographic Tower, both useful buildings that can be hard to find.

If I had a map, I would like to be able to see these structures from birds eye view, and be able to place waypoints. That way, I won't lose the vault and not spend 20 minutes circling my settlement looking for it.

It would also make charting sectors useful, giving you a reason to seek out charting points and get an overview on the area that embues the world with more depth and life to the planets your on. That way, settlements like New Mogadishu actually feel like real places that are alive and have structure to them.