A 1000 meter Grid Square. X450 reads as Grid 11 43.	A 100 meter Grid Square. X450 reads as Grid 114 434.

Hopefully with this information and some of the maps posted on this site,
you may be able to download a map.
Plot your position.  Then tell us where and when you were there and with who.

 

Find the Rock Pile. Grid XD 979 559 on map sheet Cam Lo 6342 I,  Vietnam. Map sheet is divided at 00 with XD to the left and YD to the right.