Sectional use

"Kev" wrote

For purposes of this speculation, by spoofing the satellite signals.
A GPS receiver's RAIM algorithms wouldn't know any difference as long
as the signals came with "correct" data.

It's not much different than the "evil twin" method of spoofing a
Starbuck's WiFi hotspot, and then capturing everyone's keystrokes as
they log into their bank account. That is, you simply provide a
stronger signal.

It isn't that simple because the receiver would still be getting information
from the satellite. The combined information would be a mess that would
cause the GPS to ignore that portion of the signal.

Pulling this off, if it could even be done, would be extremely difficult and
expensive - that's what makes it impractical. Beyond that, I seriously
doubt that anyone would fly their airplane into the ground as a result.

BDS