I don't, because I've visited over 5000 systems. I'm playing a video game, not maintaining a data archive. The fact that Frontier maintains a data archive yet shares as little of it as absolutely possible with the players who created the data is a sore point for me.
Bookmarks, catalogs, notes and statistics. You can't be an Explorer without them Frontier.
Edit: Annnnd I didn't realize that this thread is 10 months old.
Thanks Mr. Necro for pointing out that this fundamental design problem has persisted for a YEAR.