All sorts of things one would like to know, but won't be told, like how robust current models are (it's a rough life being an artillery shell) and what rate of drift the accelerometers have, translated into geographical terms related to time of flight etc. I guess it will be like GPS, mil use first and eventually commercialisation.
I put it up because I, for one, had no idea there were these different miniaturisable ways of achieving the gyroscope effect. Amongst other things I suppose that as long as one could calibrate the start position this could be included in a pet's microchip instead of gps, to the benefit of owners whose pets go missing. Other more sinister applications as well of course.