homepage-banner4.jpg
datum008.jpg
datum.gif
Balanacan Cove Luzon Datum of 1911
View from Balanacan Port of the mountain where the marker is located.
Sometime during the 1906, the United States Coast and Geodetic Survey (USCGS) now National Oceanic and Atmospheric Administration (NOAA), established a geodetic marker drilled in a cubic meter of diorite rock on a mountaintop located at the boundaries of Brgy. Argao, Hinanggayon and Silangan, Mogpog,  13°33'41"N, 121°52'3"E. This is the Luzon Datum of 1911, a very important geodetic point marker which is used as point number one for all map makers in the country. This marker is at first level accuracy.
Luzon Datum of 1911.
Reference Marker
Luzon Datum
Balancan Cove
Another marker etched on a diorite rock located 10 feet away from the main marker. The marker with a Brunton compass showing its direction. View of Balanacan Cove from the vicinity of the marker.
Mr Lilles & the guide
PRS92 of NAMRIA The original and new markers
Mr. Joven Lilles with the guide who led them to the site. The PRS92, a NAMRIA-built marker is an adjustment of the Luzon Datum. The old and the new markers.