A friend asked me to make a video of his house showing an approach with the horizon, and then a POI circle around his house. Very easy to do of course, but it reminded me again about my drifting horizon and how that makes it so hard to edit video in post. [Note - this is not fixable for me with any type of calibration or with the gimbal roll adjustment] I am considering buying a new camera/gimbal combo, hoping that it will give me a level horizon. If I do, I would probably get a P3P camera instead of my current P3A. This led to a couple of thoughts I'd like to run by you guys. 1. I know that I have done dozens of very level IMU and gimbal calibrations since May. I'm reasonably sure based on flight behavior that my IMU knows what level means. Does anyone know enough to know for sure if a gimbal / camera replacement would be likely to correct a drifting horizon? 2. I've seen reports of update failures when assorted modules were not detected during a new FW install. It got me to thinking about how a new camera install is handled. I know using P3P camera hardware on a P3A is not a problem. Just use P3P FW. What I don't know is what will happen if the new camera comes with a different FW version than 1.5.3 which is currently installed on my AC, especially P3A versus P3P. Has anyone done a camera swap already or is anyone able to make an educated guess about what would happen with mismatched FW versions between the camera and the AC itself? 3. Any other option that I may be missing with regards to parts? Thanks for any feedback.