4 ms·They have ADS-B transponders. You see them sometimes on flightradar24 floating around at FL650.by plantain 12y agoThey have ADS-B transponders. You see them sometimes on flightradar24 floating around at FL650.plantain 12y agohttp://theaviationist.com/2014/03/01/google-project-loon/ http://theaviationist.com/2014/03/01/google-project-loon/jacquesm 12y ago> The helium balloons are all “floating” around 1,000 feet to the southeast of New Zealand I can't make soup of that.deleted 12y ago[deleted]