Dapped, there are several out there and tower hobbies sells one (GYA350) that's on-off switchable, but don't try to hover in the heading lock mode or you'll get some surprises. When I began learning 3D few years ago, I installed a gyro on a profile plane. I eventually installed it in my OMP GS540 and FF540 to see just how hands off they would hover. The OMP Edges are so stable in hover that you can only see a tiny bit of difference, and not enough to justify spending over $100.00 on it (IMO). The upside is that when you get done with them, you can sell them. Using a gyro to learn hovering doesn't mean you aren't "manly" like some suggest, so get one if you want. I kept decreasing the sensitivity / gain until I eventually didn't need them anymore. Where I live, finding a person to teach 3D is like finding a snipe (ever been snipe hunting?) so I had to teach myself.

John Wells