The page was created out of personal interest, since the route measurement pages seem to be disappearing or are not being properly maintained. I suspect it is due to the new guidelines for the integration of the maps of a large search engine provider. If the site is visited a bit, I will also add new features like registration or satellite imagery. For the time being, however, feedback must be sufficient as a comment.
Der Flußlauf heißt Spree, nicht Spray. Was soll das heißen Spray?