Re: It isn't that
Having also worked on GPS systems (including I think some of the receivers Charles worked on) and now working for a company that bases it's core business on giving accurate distance measurements from GPS I'd add that this is hardly original or shocking news.
Our products don't look at the difference in location, we integrate velocity to give distance and have been doing so for years. As long as you don't have high accelerations it's trivial and works really well on any receiver. With heavy acceleration you have to start worrying about which receiver you are using.
Biting the hand that feeds IT
