"Where does it say it has an ARM in the invensense chip? I can see it has a "DMP" which sounds like a microcontroller of some kind running the fusion algorithm, but afaict you'd still need a second microcontroller to run the autopilot…"

"In this video: http://www.youtube.com/watch?v=4EGQZsu-kkk by John Stowers (www.johnstowers.co.nz) the processing is performed by an onboard Gumstix Overo. The Kinect is pointing down, and by fitting a 3D plane/surface to the point cloud data,…"

"Yes, it has a 3-axis magnetometer for the compass function. I can't recall if the API lets you get raw/uncorrected magnetic readings out - probably not."

"@jeffrey - if only that was true ;-) It remains one of the most locked down pieces of consumer electronics in history. Of course, jailbreaking and writing apps for iOS isn't so bad - you get to use their nice APIs, power management, comms,…"

"I doubt the built-in accelerometers, gyros, and magnetometers are any different *at all* performance-wise from the ones we hobbyists use. iOS even has a built-in sensor fusion (Kalman filter) algorithm perfectly tuned to match the sensors. I…"

"@James re mag at cm, their target market is cellphones and game controllers - there is no motor, and the baseline they could acheive is only a few centimeters anyway. I fully expect an all-in-one eventually. We already have 3-acc+3-gyro and…"

"This isn't all-in-one, it needs an external magnetometer... but otherwise, it looks pretty awesome!"

"I've pushed my OpenGC master branch here: http://github.com/hugovincent/GlassCockpit If you get in touch I'd be happy to restore Linux support and integrate your changes. Let me know."