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    <p>Ok, first the easy ones... About Q1, <strong>Gyroscope</strong> measures the <em>Angular velocity</em> (radians/second) and the <strong>Orientation</strong> is a different magnitude, telling us how is "placed" the device (I don't really know how to explain something so basic in English).</p> <p>And about <strong>Q2</strong>, I would say yes, 3-Axis orientation is avaiable on most of smartphones, at least those running Android.</p> <p><strong>Q3</strong>: Compass actually uses the Orientarion values, Magnetic Field sensor measures that magnitude, (not in degrees) though probably you can calculate the compass values with the magnetic field. Another use... well, you can tell wether the device lies upside or downside, for example.</p> <p>About <strong>Q4</strong>, this is more difficult, I'm not that expert in accelerometers, but I think most of these "Sensors" use the same hardware sensor, which measures the magnecit field and makes the necessary calculations, but I insist, maybe it's better to read more detailed and technical information.</p> <p>If you notice, now OrientarionSensor is deprecated, and this is written in the docs:</p> <blockquote> <p>Note: This sensor type exists for legacy reasons, please use getRotationMatrix() in conjunction with remapCoordinateSystem() and getOrientation() to compute these values instead.</p> </blockquote> <p>So yes, it seems it calculates Orientation values trough the Accelerometer, but still, Orientation is given in degrees and Acceleration in (m/s^2), different magnitudes. As I told you, I think they measure different magnitudes with the same sensor, that's why they present different kind of <code>Events</code> in the API.</p> <p>I hope I haven't written many huge mistakes, because well, I would also like to clarify some concepts regarding to these Sensors.</p>
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    1. COWell, I can tell you that magnatic sensor is used by orientation sesor, and it's the same hardware, for example in my acer liquid it's Yamaha MS-3C. On the other hand, accelerometer is another hardware which is in my phone Bosch Sensortec SMB380. I wish someone else comes and clrify the whole issue
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    2. COa small update, the Yamaha MS-3C has 3 pins to connect with the accelerometer
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