Hello, I fly over a forested area and lost my P4 into the thick underbrush of the forest floor. I was able to find it within a short time by reviewing the flight recording, but it was a lucky stroke, mainy because of the thickness of the underbrush. As it was I had to tramp through poison oak, blackberries, and other viney underbrush. If the arm lights had been off, I might never have found it. My question: is there a way to get the P4 to emit a sound. In my case, I had an RC connection, if there had been a way to get my P4 to emit any sound at all, it would have made recovery so much quicker. What other features can be used to home in on a downed craft? Assuming an RC connection. I believe the original crash was caused by obstacle avoidance being turned off after upgrading firmware. I upgraded, took off and smacked into a branch on my first flight after upgrade. Now, the craft seems to fly really wonky. I can't figure if it was the crash or the upgrade. I am doing a factory reset and calibrating to see if I can get it flying right again. The crash was from about 30m, but it tumbled through branches and landed in a bunch of vines. Sort of a hard landing, but nit quite a crash, it never hit the ground. The following is a list of things it does after upgrade/crash that it did not do before. It doesn't hold height like it used to, If I put it at auto takeoff height and fly forward, it slowly drops until it starts clipping the grass. Taking it up to any height and lowering it straight down gives a gradual rotation Obstacle avoidance seems to be hit and miss, slowly approaching a building stops it, but rapid approach doesn't. I'll update after reset recalibrate.