At a press briefing on Tuesday, FCC Chairman Julius Genachowski and other agency officials assured users of global positioning system (GPS) devices that GPS transmissions will be protected from any potential interference from LightSquared’s proposed terrestrial wireless broadband operations in the mobile satellite service (MSS) L-band. Fielding reporters’ questions, staff members of the FCC’s Wireless Telecommunications Bureau and Office of Strategic Planning emphasized that, while the FCC has limited authority over telecommunications receivers and can refuse to protect adjacent receivers that are picking up transmissions from licensees operating properly in their own bands, the FCC will take all steps necessary to protect millions of GPS devices that are used for airline navigation, public safety, maritime and other critical purposes. While noting “it’s been clear for years there was going to be a terrestrial component” to LightSquared’s proposed MSS broadband network, Wireless Bureau Chief Rick Kaplan told reporters: “we’re not going to jeopardize air safety or national security.” Commenting on LightSquared’s recent proposal to commence operations in the lower 10 MHz portion of the 1525-1559 MHz band which would leave a protective 23 MHz buffer between the LightSquared network and GPS operations in the 1559-1610 MHz band, Kaplan added that “we’d like not to see 20 or 30 MHz of guard band spectrum become the norm” as allowing any spectrum to lie fallow would promote inefficiency. As Kaplan noted that one goal of the LightSquared proceeding is to determine how a 23 MHz guard band between LightSquared and GPS could be used safely by satellite operators, Genachowski asserted: “we’re in the middle of a process . . . and I think it’s important for that process to continue.”