From the National Journal: Two subcommittees of the House Transportation and Infrastructure Committee announced a joint hearing to examine potential interference between LightSquared's technology and GPS systems on aircraft. Witnesses will include government officials and industry representatives, according to the announcement.

GPS companies, as well as some federal agencies like the Defense Department and Federal Aviation Administration, worry that LightSquared's planned wireless broadband network will overpower GPS receivers.

The hearing of the Subcommittee on Aviation and Subcommittee Coast Guard and Maritime Transportation is scheduled for June 23.