Same happened to me -- I lost it in some trees at the far end of my property. I was able to see exactly where it was on on the map on my iPad in the Pilot app and I could even see what the camera was seeing. With those two clues I knew I was standing in the right spot but I couldn't find it for almost an hour even though it was right over my head, blinking lights and all.
Some sort of audio distress call sound feature would have made it much easier to know where to look.
Some sort of audio distress call sound feature would have made it much easier to know where to look.