FYI I've been running some tests since this latest firmware update and found that if you toggle the flight mode switch on the controller to 'F' a modal box now appears with info about using the IOC 'Course Lock' function?! I tried it out in the simulator and it seems to work, haven't tried it on an actual flight yet. It also appears when in camera and map modes so I'm guessing its available for use. Note the blue 'CL' button in the top bar. Interestingly in the flight modes menu, if you try and toggle the IOC switch which has been there since the start it just toggles back (inactive button I guess). My basic understanding of course lock is that it just resets the 'front' of the aircraft to a new angle of your choice. I have never really understood the actual reasons why someone might want to use the course lock feature, but I would love to see an example and explanation though.