Re: Easy solution
Fairly sure they are not the 'very same sensors' - INS sensors are at least 2 or 3 orders of magnitude better than your phone. There was a nice write up of a couple of guys trying INS on a phone They had drift of several metres a minute with the device stationary on a desk, so better hope that ILS approach you need to hit to 20 metres is no more than about 5 metres away.