Thanks, The Ghost and ps2727.

I (He) would have someone ask to read out the live data(speed,etc)
while I(He) fly the airplane.
If I installed the system, I would use it for approach and landing
to make a sure and safe landing.
Yes, I(He) would use it on relatively large scale airplanes.
I understand they are so practical that we could use and trust it.
I appreciate your input.

Tsutomu Mabuchi