Map with Unknown Coordinate System

Question

Hello!

Does anyone happen to know what coordinate system this is? Or what format? We're having trouble georeferencing the map as the placement itself is not accurate on the satellite imagery basemap (highlighted by red arrows). A detail on the map says that the projection is Universal Transverse Mercator Zone 51N, but if it was the placing should be right (which is not).

Thank you!!

MShairah · Answer

Hello Dan,

The Datum is WGS 1984. I forgot to mention that this is in the Philippines. The main problem is that the coordinates along the side of the map is not in DMS format and these don't match the coordinate system indicated in same map. Should we just do a trial and error on UTMs that encompass this region?

Thanks

danretired · Answer

What is the datum?  If the differences are in the order of 100s of meters, it could be a difference in the datum, which a UTM map of the same specs can have several (eg wgs84, NAD27 and others specific to your region)