Wind blade equipment today, probably constitutes roughly 20% of ocean-borne multi-purpose heavy lift cargo today.

FORBES: Intermarine Executives Discuss Ship Financing, Piracy, and Global Maritime Trade

Regardless of how effective the filters might be, the idea that the only thing standing between a functional GPS system and a constellation of space-borne paperweights is a private company's privately-developed, privately-operated filtering equipment... but then again, we love LTE.

ENGADGET: US Air Force raises concerns over LightSquared's LTE network messing with GPS