And I wanted to mention that last night I tried both methods of scanning the system to reveal the USSs. Scan the nav beacon, or use the FSS. I'll stick with the nav beacon, although I like the FSS. I found the nav beacon was a little faster on average. You need to navigate to it, then drop and scan it, which takes time. So in systems with few signals the FSS may be faster still.
But the beacon is complete, it reveals every signal, so no worries you might be missing one. And in systems with many signals, I think it's just a better way to go about it.
The nav beacon also has the added advantage of being filled with targets. So a quick look might reveal a wanted T-9 or Conda and provide some mats that way too.