Luzon 1911 / UTM Zone 50-52N

+proj=utm +zone=50 +ellps=clrk66 +towgs84=-133,-77,-51,0,0,0,0 +units=m +no_defs

+proj=utm +zone=51 +ellps=clrk66 +towgs84=-133,-77,-51,0,0,0,0 +units=m +no_defs

+proj=utm +zone=52 +ellps=clrk66 +towgs84=-133,-77,-51,0,0,0,0 +units=m +no_defs


PRS92 / UTM Zone 50-52N

+proj=utm +zone=50 +ellps=clrk66 +towgs84=-127.62,-67.24,-47.04,-3.068,4.903,1.578,-1.06 +units=m +no_defs

+proj=utm +zone=51 +ellps=clrk66 +towgs84=-127.62,-67.24,-47.04,-3.068,4.903,1.578,-1.06 +units=m +no_defs

+proj=utm +zone=52 +ellps=clrk66 +towgs84=-127.62,-67.24,-47.04,-3.068,4.903,1.578,-1.06 +units=m +no_defs