See the linked report on Panbo.
It seems that the US FCC has granted a waiver to a company to transmit on a band adjacent to the GPS
band for wireless internet service
. They've already installed 4600 transmitters (out of a planned 40,000) despite Garmin's tests that show serious interference
including the complete loss of GPS
fix on aviation Garmins at over 5 miles from a transmitter.
Seems that some folks at the FCC need to take a Ham licensing course.
I think some pressure from the cruising community is needed too.
I can't get the full link to fit. You may have to search Panbo for "Lightsquared"