"Johnny is right. There are a lot of amateur high-altitude balloon launches being done which are recording GPS data between 60,000-100,000+ ft. The majority of gps modules won't allow it, but there are some out there that will. I came here because I…"

"I'm hoping to hear an answer on this too. I'm wanting to use the APM to guide a balloon-dropped glider back to the launch point or to a remote touchdown site. Basically high-altitude balloon payload that navigates its way home. So I need an APM that…"