One should always test theories multiple times, not just once or twice. It appears that nodes are in fact not static but appear at a random location within an area. Hence the theory that the project was based on is false and hence there's no use in continuing. I did try the theory in the graveyard and in the Commonlands but I must have been very lucky (or rather unlucky) to have the node respawn at the same spot.
I will upload the source-code for the project for those interested. It contains some useful code for parsing, updating and projecting things on a map based on ingame coordinates. Here's the Commonlands with the SE mapped:
A new tab has been created to hold the source-code.