title_body: How to avoid a drone going out of range? I have a simple drone (less than 250 grams), I want to fly it as high as possible to take photos with it, how can I make sure it doesn’t go out of range considering it has no altitude indicator? What would happen if it does go out of range, would it just fly off?
upvoted_answer: The first stage is to make sure you read your local laws about altitude and VLOS restrictions.
  
  Once you know what you can legally do, the first stage is to set up a failsafe. Do this by setting failsafe conditions in your radio and in whatever firmware your quad uses. Choose what you want the quad to do during a failsafe, whether it should drop out of the sky or slowly lower.
  
  You can also install GPS and set the failsafe as a return to home, and depending on your firmware there are different ways of doing this.
  
  Another way to make sure you stay in the range is to set up RSSI or LQ depending on your system. This tells you how strong the signal is so you can monitor it.
  
  You can also get an RF meter to make sure there is no interference where you intend to fly.
  
  Finally, you can use a specialty long-range system like TBS Crossfire or FrSKY R9, as long as it is legal in your region.