On Thursday, the group also downplayed LightSquared's recent claims of technical solutions to the interference problem in the new band it plans to use. Earlier this month, LightSquared joined with Javad GNSS to that it said could be easily added to many of the precision GPS receivers. The carrier also said Partron America has an appropriate filtering component, and on Thursday it announced that PCTel has developed an antenna that solves the interference problem.

The technical fixes LightSquared has announced are "prospective only" and would probably be harder and more expensive to implement than LightSquared has suggested, Kirkland said.

"You don't just screw the top off a survey machine and put a new filter in," Kirkland said.

How much a GPS fix might cost and who should pay for it have started to play a bigger part in the debate over LightSquared's network. LightSquared has said it already committed millions of dollars to changes to its own technology and will contribute up to $50 million to fix gear owned by federal agencies. On Thursday's call, Kirkland and a representative from the National Association of Manufacturers said businesses and agencies that use GPS shouldn't have to foot the bill for upgrades that they said could cost billions of dollars.

LightSquared said GPS vendors should be held responsible.