Re:Why... (Score 1)

I would concur with that supposition. The weighting for navigational algorithms probably places the highest weight on military gps, with a fall back to non p-code gps, and then to ins, vpu (vor/ndb/dme/tacan/etc), or dr (est heading * est speed * time (doing the math)). With the long time on station, the potential for induced errors from the ins (esp if mems-based gyros/accelerometers) due to long period sustained turns grows (somewhat logarithmically) and as such the sw engineers probably placed the ins and terrestrial based nav alogs as a lower weighted inputs than what is provided from 3d or 2d gps (military or otherwise), and with GPS being so 'reliable' the alogs might have actually deselected the other inputs as nav sources, if the gps' position differed greatly (allegedly due to the spoofing), removing any possibility of the uas recovering. In the end, only the usg and oems will really know. I suspect, if the story is founded in truth, that they cease all hostile theater operations pending a rewrite of the code. This could have significant short-term impact on all uas theater operations. Someone's head will prolly be offered sacrificially too, for some perceived bad decisions. I suspect that we can all rest assured that the hole will be quickly plugged and a fix disseminated rather expeditiously. At least I hope so...