http://www.kansascity.com/2011/06/30...interfere.html
this is what Garmin is saying today: Posted on Thu, Jun. 30, 2011
12:10 PM
"Before the Working Group’s testing began, LightSquared insisted that
its transmission would not affect the GPS signal. Garmin’s own test
results indicated otherwise. LightSquared then suggested that it had a
filter on its transmitters that would solve any possible jamming
issues. The Technical Working Group’s test results indicate that this
filter will do little if anything to end LightSquared’s interference.
In fact, there is no evidence that any effective filter solution
currently exists for LightSquared transmitters or GPS receivers, and
even if an effective one could be developed, it is years away from
implementation.”