Basically headtracking (Ed Tracker or TrackIR5) works by tracking your head movements via a device worn on your head (either on a baseball cap or else attached to your headset). They can track movements to the left, right, up and down. TrackIR5 can also track head tilting movements (you can see it in that video when I'm in hyperspace and tilt my head as I look down at my hands) and even as you move you head closer to the screen (e.g. so you can lean in close to read text). They employ an acceleration "curve" so small movements just off center are tracked smoothly and pretty much 1:1 while larger movements are exagerated (e.g. you turn your head about 30° to the left for an in-cockpit movement of about 180° to the left). The thing everyone puzzles over is - "hang on, if I turn my head away from my screen, surely I'm not looking at the screen any more ... how does that work?". The simple answer is that it just does. I don't know how but somewhow our brain just deals with it. You turn you head but just naturally keep your eyes focused on the center of attention (e.g. the ship you're dogfighting, the planet you're skimming past, or the installation tunnel you want to fly through next). I have to say, aside from the joystick, it's the single best add-on you can get for ED (until you can afford full VR - and even with that - I have Oculus - when you switch back to playing on the monitor, head tracking makes that's transition far more tolerable) and can't play the game without it now - being forced to look straight ahead just seems sooooo limiting.
Basically: Highly recommended!
Obsidianant did a youtube feature on using his TOBII track IR I think it is - very interesting if you watch it - he goes through the initial set-up and play.
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