Unfortunately, the coordinates don't line up quite accurately with any of the thaumametors. It does suggest that the abductors aren't aware of the thaumametors or otherwise don't have any interest in them.

However, because the thaumametors are so spread out across Thorne, one of the coordinates is in the general area of one located in Borrel. They can try their chances regardless, since there have been few leads in Borrel thus far.

If they want to check on the thaumametor while they are there, Stephen's watch will spin as they draw closer like it is unable to sync with the closest node. If they remember where they placed it, they will find that it is askew and pointing in the wrong direction. Intentionally or otherwise, the device as been moved. If they examine the area they will find scattered footprints in the earth. The footprints lack any defining features of normal human feet like toes or a sole and are missing treads that shoes would have. They are almost perfectly smooth.

They can also examine the coordinates themselves. They won't find anything relevant to the investigation at hand, but it'll confirm that the man who has the map isn't directly involved in the disappearances and was only paid for a task.