Device doesnt measure airspeed..
@cee cee...
There are aircraft that do not have pitot tubes...
I carry a nice little unit that displays g, attitude and flight path using a nice kalman filter, it is far better than the 100k i recently spent on an IFSD upgrade. Why do you need airspeed? With extraordinarily accurate att and fpv, i can generate airspeed if it makes you feel better, but tthe sircraft doesnt care, it only knows alpha and g loading. And until we as heavy jet pilots remember that we are going to repeat upsets.
Now for the subject topic of AAsias tragedy, how about letting the experts get on without the static that this forum generates with such ease. Sontoso et al are able to fibd and annalyse such an event with reasonable confidence, let them do their job, and let the families and airline grieve in respectful peace.