Hi,
I have updated to 3.3 and would like to test the PX4 optical flow, according the Wiki i need additional rangefinder for height control:
Several questions…
Why can’t we use the Barometer for the height ?
After installing everything and checking the sensor i can see it works fine according the logs 
imu vs of
the Wiki mentions to use of_loiter, but this is not available 
Is there a plan to use both GPS or OF (controlled via remote)
Thanks
Thomas