Airblue down near Islamabad

[PEI_3721]

Re #120.
We are all children of the magenta line.
Unless EGPWS has a precision nav input (and appropriate ground stations) or preferably its own embedded GPS then the system's operation can be severely limited.
The basic GPWS may still provide some alerting, but this in only using rad alt, may not give a sufficiently early warning in steeply rising terrain.
Rather than the regulators adjusting training and ratings, there would be much more value in mandating a relatively cheap GPS 'card' in EGPWS.