Seventy percent of our planet is covered by water, and even in todays world of instant communication the global community is still heavily reliant on sea-based transport. The maritime domain has always been one of NATOs key strengths, but concerns about maritime security have taken on renewed importance in recent years, and NATO has been forced to re-examine some of its fundamental assumptions about the post Cold War security environment.This book shares some of the research, debates and findings from a NATO Advanced Research Workshop ARW Building Trust to Enhance Maritime Security, held in Geneva, Switzerland, in November 2014.