I am working on a data set and coordinates are supposed to be in DHDN Bessel 1841. Have a look here: https://www.pegelonline.wsv.de/gast/stammdaten?pegelnr=2330013
I created a shapefile with the cordinates. But I need to define the projection. I am using qgis and when I checked DHDN options, there were a lot like DHDN/ Gauss-Kruger 2,3,4,5 or DHDN/ 3-degree gauss zone 1,2,3,4,5. I am confused which one to use.
Some insight will be of great help.