Hello everyone and a very pleasant 2021 to all.
Last night I was watching a program concerning Air France flight 447 from Rio de Janeiro to Paris. They discussed the cause for the crash and reported that the pitot tubes became frozen and thus the pilots, without any visual references, could not save the aircraft. I do not blame them for that because I cannot judge what I do not know.
What I do know is that GPS signals have been available to aircraft for many years. I have had an application on my iPhone for a few years now that tracks my location, altitude above mean sea level, and velocity from satellites. It updates as I drive down the road. We will drive on to an overpass that could have a 10 story building underneath it in my altitude changes as I go.
While I am not sure if this application was available for iPhones in 2009 it certainly makes sense that it should have been available to aircraft. Why do not aircraft use GPS for backup navigational data?
There must certainly be some eloquent and reasonable explanation. I just cannot think of what it is. Please enlighten me.