The Luzon Datum of 1911, also known as Station Balanacan, is a stone marker on top of Mogpog's highest peak. It marks the base for the first modern survey of the Philippine Islands, which, also signifies Marinduque's position as the geodetic center of the country. It began at the start of the 19th century when the United States Coast and Geodetic Survey (USCGS) was sent to Manila with instructions to prepare a report on the existing cartographic conditions in the Philippines and to obtain data for the execution of geodetic, hydrographic, and topographic surveys in the country. In 1911, the different triangulation networks on different datums and with different origins were consolidated into one nationwide network, leading to the establishment of Station Balanacan as its datum origin.
