The ROC Government established the Triangulation Benchmark as the triangulation point for Pratas Island in December 1991. There are words on each side of the base of the triangulation point stone tablet. They read 'The Pratas Triangulation Point' on the front, and 'Longitude: 116o 43" 42.5601'E, Latitude: 20o 42' 6.2415'N, Height: 2.4875 meters.' The words 'Defend the South China Sea', written by the commander, Lo Ben Li, were also engraved on the stone tablet. The National Tsing Hua University webpage about the island states: "In addition to making it more convenient to survey and draw navigational maps, and to construct and develop facilities on the island, the establishment of the triangulation point is also the basis of our sovereign rights."