Quadcopter Altitude Reference

I'm new to all this but I have a question on how UAV determine their height above or below the launch site? I imagine on most flights, you place the UAV on the ground and arm it and it does a check on where it is and then you proceed to altitude above the launch site, but what happens if you start on a cliff and fly down to the beach? Does it not matter? Is the UAV able to calculate heights below its starting point?

Any simple explanation is welcomed.

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Replies

  • Yes, it will use negative altitude when flying below the home altitude.
    • Thanks iskess,

      I was hoping that was the case.

This reply was deleted.

Activity