I was exploring some deep irregular canyons. It was really rough terrain and hard to drive, it was spooky and really felt like I was in the same environment as the clip from the Horizons video (except for the gravity). Anyway, I don't think your efforts of Arial search will produce anything. Nothing renders at that height from what I can tell. The environment I was in was almost impossible to spot anything from air. Even the bases don't render that far up, usually I fly less than 500m to really see things. I actually target a height of 200m, and even then things to the left and right at a distance wont render. Get in your SRV's and get into tough spots. Here are some images from my efforts in the canyons. http://imgur.com/a/sZseq I don't think they would make it easy to find secrets. I am not recording the sounds my UA makes, but I do believe it is significantly different in some systems or planets. If someone has the time to record the sounds in different systems in space and on the surface, it may reveal a clue. I do believe having the UA is involved in finding the barnacles or meta alloys, it is the key in my opinion. I also believe you don't need one, you can get lucky without one, but to find one efficiently, we need to understand what the UA is trying to tell us.
Another thing that may help is AI Artefacts, I only say this because I have found a few around Merope, but I was unsucessful in picking one up. I destroyed the first one accidentally trying to pick it up while getting swarmed by unfriendly NPCs. The second time the NPCs destroyed me. They are found in Weak or Strong Signal Sources close to the sun. I will experiment more when I get a chance.
Happy hunting.
Another thing that may help is AI Artefacts, I only say this because I have found a few around Merope, but I was unsucessful in picking one up. I destroyed the first one accidentally trying to pick it up while getting swarmed by unfriendly NPCs. The second time the NPCs destroyed me. They are found in Weak or Strong Signal Sources close to the sun. I will experiment more when I get a chance.
Happy hunting.