Rockets that go above 60,000ft and at 1000kt are the case that this limit was designed for, they didn't want enemy ballistic missiles guided by GPS.
Of course that regulation is now useless because foreign receivers don't implement the limit and competing GNSS systems also don't have it. But at the time it was written this was a sensible restriction because it was a unique technology.
Of course that regulation is now useless because foreign receivers don't implement the limit and competing GNSS systems also don't have it. But at the time it was written this was a sensible restriction because it was a unique technology.