Inertial Motion Capture technology is based on miniature inertial sensors, biomechanical models and sensor fusion algorithms. Most inertial systems use inertial measurement units (IMUs) containing a combination of gyroscope, magnetometer, and accelerometer, to measure rotational rates. These rotations are translated to a skeleton in the software. Much like optical markers, the more IMU sensors the more natural the data. No external cameras, emitters or markers are needed for relative motions. Inertial motion capture systems capture the full six degrees of freedom body motion of a human in real-time. These systems are similar to the Wii controllers but are more sensitive and have greater resolution and update rates.