第三艘J506“永兴岛”号在1980年中期可能进入南海舰队服役。

The third hull J506 Yongxingdao was commissioned by the South Sea Fleet possibly in the mid-1980s.

注：海南省还管辖西、南、中沙群岛及其海域，群岛设立办事处驻西沙永兴岛。

Note: Xisha, Nansha and Zhongsha islands and their surrounding sea areas are the territory of Hainan. Islands' office was set up in Yongxing island which is in Xisha Island.