Some more info:
KGPS is the "location" needed to find GPS NOTAMS. Or go to the US Coast Guard site, which for some reason, is the source of those NANU (GPS for NOTAM)
Notice
Announcements for
Navstar
Users.
The US Mil cannot use Y-code for navigation in civil airspace, our GPS navigation was certified for C/A signals only. There have been one or two huge screw-ups (read: domestic GNEs using bombing computers as nav devices in US civil airspace
)
When they started bombing with GPS navigation, errors were found by targeteers where bombs aimed for the top of the building (think elevator shaft) instead hit near the first floor. Hence targeting had to get smart on how to program for elevation. Also, a mid-90s Space Shuttle mission, I believe classified, spent 12 days mapping the earth for elevations which, in turn, produced the obstacle and terrain data used by Enhanced GPWS.
The detritus of the years
GF