Is there anyone in this group that can help translating military map coordinates (pre-war NZMG) to present day WGS48 (GPS) coordinates? The coordinates I have show an Easting of 227881.2 and a Northing of 671748.1. I'm not sure of the unit of measure, but I believe it to be yards. These coordinates are from a fort record book for a NZ coastal battery (1940-1948) and pinpoint the location of the unit's radar site. New Zealand reference datum changed in 1949 and I have been unable to find any earlier reference. Any help would be appreciated.