I have a set of Vietnam Topographic maps from the late 1960's with grids in UTM. The projection listed in Indian 1960 (it doesn;t mention which one)
I want to bring these maps into my mobile map viewer (Memory Map) but need to callibrate the tiffs to UTM WGS84. There is a discrepancy of approx -330m east and +270m north. (APPROX)
Can anyone help to pinpoint which conversion this may relate to?