Active Track is now useless for the most part in this GO4 version. It's a lot less intuitive to use and AC is so slow that it lose track of any moving object, even really slow ones. Before I had it working very well in all modes and situations (GO3, now won't work with MP and P4P anymore). I was able to film myself on the bike and everything. Now I can't even find the menu/buttons to pick the AT mode (Spotlight, Profile, etc.). This sucks, will wait for DJI to correct it - unless someone knows how to roll back to previous GO3 and 4 apps in iOS devices!