The mystery over the whereabouts of Malaysian Airlines Flight MH370 is a very serious and tragic matter. That the 777 was equipped with sophisticated tracking devices and could still disappear confounds me.
Let’s assume the pilots turned off the transponder. This is a serious question: Why are the transponders manually operable? Is there any value to a commercial pilot or navigator being able to “go silent?”
Perhaps there is, but I don’t see it.