For those not aware....
It appears the FCC is going to give a company, Lightsquared, the rights to the frequency next to the L1 used for GPS. Lightsquared is developing a LTE network.
This could totally screw up any GPS units currently in use, and that includes those used by Pilots and on cell phones
Battle with cell phones for bandwidth worries GPS industry - KansasCity.com
Coalition to Save Our GPS