1) once you are at altitude engines are amazingly efficient. I still can't believe 1 liter got them across the Atlantic, but 100s of km, definitely.
2) Decades before GPS there was gyroscopic navigation. There has been autopilot for RC planes since as far as I can remember, for me the 90s.
3) There are many other radio bands available besides 2.4GHz. And satellite is not the only option. You have packet radio, marine radio, and HAM (amateur radio).
2) Decades before GPS there was gyroscopic navigation. There has been autopilot for RC planes since as far as I can remember, for me the 90s.
3) There are many other radio bands available besides 2.4GHz. And satellite is not the only option. You have packet radio, marine radio, and HAM (amateur radio).