A GPS That Can Tell You Whether You Are Sitting Or Standing

Well that one is not here yet, but will soon be. GPS systems generally do not work when the signals are interrupted by walls - shopping malls or in the midst of tall buildings. We spotted this today, that InvenSense (INVN.N), which makes gyroscopes and other motion sensors, plans to sell chips within a couple of years that let smartphones guide their owners up and down escalators, through subway stations and up to specific cubicles within skyscrapers - all places that GPS signals do not currently work well.