Nice hack! I wonder what other useful common digital signals can one record with a dongle? Time and date, teletext (which includes weather forecasts and news) I

Nice hack! I wonder what other useful common digital signals can one record with a dongle? Time and date, teletext (which includes weather forecasts and news) I am aware of. There is also project Lantern & Outernet which might deliver 20 MB of data to all continents through nanosats next year. What other digital signals are transmitted?