Good morning Sharon,
I have some more updates for you. The brother of a colleague went to the cemetery and came back with the following -
"We found the exact location with the details given (# X82380 Longtitude Hh, Latitude 8). It's an unmarked grave so the photos will help to see the space where the grave is.
Looking at the first pic below - The second grave stone from the left is that of Peter Hendrick 1832 - this is Longtitude Gg. So the unmarked grave is directly in front of Peter Hendrick (between Hendrick and the tree).
From another angle - 2nd pic - the gravestone in the foreground is Peter Hendrick - the taller, white-ish stone further back is that of Eliza Moran 1862. She is in Latitude 8. So the unmarked grave is between her and the tree (see blue dot).
I hope this info helps. Where you able to get some more info yourself?