I am brand new to this activity. I have a 3DR Solo. The very first flight I had the camera orientation set wrong and Solo became unbalanced and flew off over the house and into the woods, I thought. It took me a while to find it. So I am looking for a feature(Solo may already have it) that makes a loud sound at a command is sent.
I found it on the roof. I started the motors and could hear the props.
That's a terrific idea. Just something in an app that forces a continuous "chirp"... like "find my iPhone" does.