We all are aware of the intermittent interference with GPS resulting from various human activities. The US Government now proposes to license L-band, broadband transmissions which have been shown to seriously degrade GPS signals (read: completely jam).
The Coalition to Save our GPS appears to be taking the high road in dealing with the issue, I suggest you may want to become better informed on this matter and perhaps involved. While the Coalition has a US focus, its activities may be of interest to those operating in the US littoral areas.
Panbo.com has additional technical details.