Safety measures Navigation -- 3 Terrorism -- 3 Biotechnology 2 Food -- 2 Foreign relations 2 Pirates -- 2 more ... Strategic aspects 2 Ammunition 1 Boats and boating -- 1 Bombs 1 Economic aspects 1 Emergency management -- 1 Food contamination 1 Hijacking of ships -- 1 Land mines -- 1 Maritime Terrorism -- 1 Merchant marine -- 1 National security -- 1 Natural disasters -- 1 Nuclear disarmament 1 Nuclear warfare 1 Nuclear weapons -- 1 Nuclear-weapon-free zones 1 Piracy -- 1 Pirates 1 Prevention 1 Safety measures -- 1 Safety measures. -- 1 Security measures 1 less ...