score:4
Those measurements are in meters. The area around ΕaguszΓ³w is about 160 meters above sea level.
I do not see the divisions of 3.4 meters to which you are referring on the map. However, in old Germany there was local land measure called the rod ("ruthe") which was highly irregular and varied from place to place and could be anywhere from 3 to 5 meters in length. The Prussian standard Ruthe was 3.466m, but as I said, in actuality for a given place the Ruthe could vary considerably.