I did do the calibration. I’m not sure what it’s measuring, but the values that show up in the upper left corner while calibrating it are all over the place! I have see values from .9 FPS to 30 FPS displayed.
I recalibrated it today and this time I only accepted the low numbers. I think they were .9, 1.2, and 1.7 FPS. I tried it again, and while it’s not perfect, it was better. It did activate the RAV on 4 out of 5 shots, but it also activated once when I cocked the rifle! I probably should have passed on the .9 reading and just accepted 3 reading that were in the 1.2 - 1.8 range. I’ll keep playing with it. I did enjoy the RAV feature when I had my air speed, so it would be great if I could figure out how to get it working reliably on my Crown!