Do I need to log in to record my trip?

Yes, you can record your whereabouts without logging in the health code, because the health code has been registered once and used once when traveling, and you have already entered big data. Even if you don't log in later, you can record your whereabouts in real time. Big data already exists. When you go to any station, bookstore, etc. in public, you must show your health code. When it is displayed again, it will show the cities you visited in the past 14 days and whether the health code is green.