Plans by LightSquared LLC to deploy a national wireless broadband network that would operate on both mobile satellite service (MSS) and ancillary terrestrial component (ATC) spectrum that would be used on a stand-alone basis by wireless carriers have attracted the attention of the European Commission (EC), which warned that transmissions from the LightSquared network would potentially interfere with Europe’s Galileo global navigation system. Writing to FCC Chairman Julius Genachowski, Heinz Zourek, the EC’s director-general of enterprise and industry pointed to tests conducted by the European Space Agency (ESA) that show “transmissions from LightSquared base stations do indeed have considerable potential to cause harmful interference to Galileo receivers” and to aviation systems that rely upon the European Geostationary Navigation Overlay Service. Adding that “interference effects have been determined to occur in the range [of] 100m to 1000km, depending on the type of receiver being used,” Zourek asserted that LightSquared’s proposal “obviously presents a grave threat to the viability of providing a Galileo service in the U.S. – a service which . . . will not only benefit Galileo users, but those of GPS too as the two systems will be interoperable.” While urging the FCC to consider the results of the ESA tests, Zourek voiced confidence “that the process put into place by the FCC to deal with internal U.S. concerns about the threat to GPS reception will reach appropriate conclusions and that these will take into account our own concerns about the reception of Galileo signals.” Noting that Zourek’s letter “is focused on LightSquared’s former plan” that was developed before LightSquared shifted its proposed operations to lower L-band channels that are less likely to interfere with GPS, a LightSquared official reiterated that his company “is very confident that its solution will resolve any issues about inference.”