Hmm, I thought the manual said that app link was to enable obstacle avoidance. I searched on F mode and IOC in the manual but didn't find anything.
If course lock only works in P mode, that means I can't chase boats and wakeboarders anymore due to the slow speed of P mode. Hmm. That use to work great in my P3, allowing me to keep the camera on the subject, independent from the flight path. Tracking won't work either, too slow in P mode. Oh wait, tracking works in S mode too!