If a single MEMS sensor is good, a system that provides 10 degrees of freedom (DoF) should be an order of magnitude better.
The three ST MEMS sensors include a geo-magnetic module, a gyroscope, and a pressure sensor. With these sensors, a consumer device can provide a complete indication of its linear acceleration, angular velocity, earth gravity, heading and altitude. The sensors provide three axes of linear motion, three axes of angular motion, three axes of magnetic motion and an altitude axis resulting in ten degrees of freedom (DoF).
In a 3 x 5 x 1mm package, the LSM303DLHC geo-magnetic module integrates three-axis sensing of linear and magnetic motion.
In a 4 x 4 x 1-mm package, the L3G4200D three-axis digital gyroscope provides output accuracy and stability over temperature and time.
While it is only available now in the 10-DoF sensor solution for evaluation, the pressure sensor provides the altimeter portion of the system. In a 3 x 3 x 1-mm package, the device has an operating pressure range of 260 – 1260 millibars. This corresponds to the atmospheric pressures between -700 and +10000m relative to sea level.