forums.naturalpoint.com

What is the positional 3D accuracy of the TrackIR?

I am looking for a spec like the OptiTrack cameras of +/.20mm. I have searched the website for specs and the forum and can't seem to find anything.

I'm looking for similar info.
Our recent testing puts the 3D tracking error at ~10 cm in the space we're using. That testing includes recent and frequent calibration.
I'm also looking for suggestions about possible "tweaks" to improve accuracy.