"But LightSquared reckons better filters are all that's needed, and now claims it will have 25 working prototypes of such filters within the next couple of weeks."

Before LightSquared mentioned before that they wouldn't interfere with GPS at all and welcomed the GPS industry to the tests. The tests clearly showed that there was interference, so this wouldn't be the first time, the second time or even the third time that LightSquared has lied.

If they filters were commercially available in a month, it wouldn't change a thing, how many devices would need to be replaced? Car NAV's, portable NAV's, phone, aircraft, etc. Sorry, but unless you are talking about a decade long plan before you light your network up, it won't help.