[woodreau]

Of all of the military weapons that use GPS guidance, none of them use RAIM or WAAS. They use the military PPS signal. The biggest limitation to all these GPS guided weapons (from my point of view)- none of them can hit moving targets.

RAIM and WAAS are enhancements to the basic GPS signal that the aviation community needed because lives (pilots and passengers in the airplane) really are depending on that GPS signal working.

The maritime industry also uses differential GPS, but it's not as critical.