The United States' maritime coastal security poses a significant challenge due to the vastness of its coastline and the complexity of its maritime borders. According to the National Oceanic and Atmospheric Administration National Geodetic Survey there are approximately 95,000 miles of coastline. According to the Department of Homeland Security 2007 Transportation Systems publication there are “361 ports, and 3.3 million square miles of Exclusive Economic Zone (EEZ) to secure”.