Luzon Datum of 1911

The Luzon Datum of 1911 is the primary geodetic reference point for the Philippines, located on a hill in Barangay Hinanggayon, Mogpog, Marinduque. Established in 1911 by the U.S. Coast and Geodetic Survey, it served as the origin for triangulation and mapping of the archipelago. Marked by a stone monument and historical marker, it is recognized as the geodetic center of the Philippines and a significant landmark for cartography and surveying history.

Visitors can expect a small hilltop site in Barangay Hinanggayon with a stone monument and historical marker indicating the Luzon Datum Origin. The site is set in a rural, elevated area surrounded by vegetation and offers views of the surrounding landscape and coastline. There is a simple marker structure with inscriptions explaining its geodetic function. The area is quiet and undeveloped, suitable for brief sightseeing, photography, and reading the marker information.

Established in 1911 by the U.S. Coast and Geodetic Survey as Station Balanacan, the Luzon Datum served as the datum origin for the triangulation of the entire Philippine archipelago. All geodetic surveys and topographic maps of the Philippines were referenced to this point for decades, making it the foundation of modern Philippine cartography and surveying.

The site is a recognized historic landmark and symbol of scientific heritage in the Philippines, often referred to as the geodetic center of the country. It is valued by the local community in Marinduque as a point of provincial pride and educational interest related to geography and national mapping history.