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The Tsurugi class （(日本語:つるぎ型巡視船)） is a class of small patrol vessel of the Japan Coast Guard (JCG). The development of this class was one of the earliest attempts of the JCG to deal with spy boats from North Korea. In March 1999, the JCG tried to intercept vessels of unknown nationality suspected to be North Korean, but the unknown vessels were too fast, and the Japan Maritime Self-Defense Force had to be called to intercept the unknown vessels. As a consequence of this failure, JCG realized their need for high speed interceptors.〔Yoshifumi Mayama 2008, p142.〕 The Tsurugi class is referred to as ''High-speed, Special-Purpose Patrol Vessels'' (). Planned as the top-tier of JCG intercept spy boats, this class features very high speed and accurate firepower. Its weaponry includes a JM61 20 mm Gatling gun, and a Remote Firing System consisting of a remote weapon system with a laser-optical fire-control system.〔Shigehiro Sakamoto 2008, p134.〕 In the Battle of Amami-Ōshima, the combination of the 20 mm gun with the RFS proved its worth, but it became clear that its effective range was insufficient against weapons on board the North Korean spy boats such as 9K38 Igla MANPADS and B-10 recoilless rifle. In response, the JCG intends to organize mobile flotillas combining Tsurugi-class vessels with vessels of the Hida class and the Aso class, which have Bofors 40 mm L/70 autocannons.〔Shigehiro Sakamoto 2008, p135.〕 ==Ships in the class== ;PS-201 Tsurugi :Commissioned: February 2001 :Home port: Sakata, Yamagata ;PS-202 Hotaka :Commissioned: March 2001 :Home port: Maizuru, Kyoto ;PS-203 Norikura :Commissioned: March 2001 :Home port: Fushiki, Toyama ;PS-204 Kaimon :Commissioned: April 2004 :Home port: Naze, Kagoshima ;PS-205 Asama :Commissioned: April 2004 :Home port: Hamada, Shimane ;PS-206 Howo :Commissioned: January 2005 :Home port: Nagasaki 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tsurugi-class patrol vessel」の詳細全文を読む スポンサード リンク
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