LIGHTSQUARED UPDATE: Transportation official: LightSquared ‘not compatible’ with flight-safety devices. “He told lawmakers on the House Transportation and Infrastructure’s subcommittee on Aviation that LightSquared would disrupt GPS systems that pilots use to help them navigate in low altitudes, including devices that warn them when they are getting too close to terrain. Porcari said the Federal Aviation Administration has spent $2 million testing LightSquared’s network. He called spending that amount of money to review a private company ‘quite unusual.'” But the White House was very interested.