"I was under the impression that most off the shelf GPS units do not work at this altitude, but obviously this is not the case. Do companies (like ublox) put any firmware restrictions so they do not operate at certain altitudes/velocties???"
"I've wondered if lining the case with aluminized mylar as a radiative heat reflector would help. I experimented with an emergency space blanket recently, and its effect was really noticeable in my living room. It's also very,…"