What is the incremental cost of this new IMU technology on top of a supporting GPS? It would be interesting to see where else it could be used. As a 23 mm cube = 1 square inch, it sounds like it is still too large (or was there an error in the dimensions in the article) to incorporate into a mobile phone. How much might the pricing come down with high volume production? If affordable (and small enough), it would be a natural replacement for any GPS system to improve accuracy when out of range of the satellites.
IMUs have been available for years, as part of the inertial guidance systems of everything from ships to spacecraft to missiles. However, by incorporating cheap MEMS sensors, instead of expensive ring-laser gyros, TRX and other OEMs are bringing down the price of location tracking for a variety of applications, from finding people to protecting important assets.