Also most receivers for super economically important things like a avionics or marine navigation, but shutting off WAAS specifically (augmented accuracy data fo

Also most receivers for super economically important things like a avionics or marine navigation, but shutting off WAAS specifically (augmented accuracy data for GPS broadcasted using a much smaller set of satellites) would affect air traffic that need it to land in low visibility at an increasing number of airports. Though, to the OP's point about GPS, WAAS is operated by the FAA, so it isn't clear to me whether not passing the defense authorization would affect it in the near term.