He has the maps there, but my high skrule German cannot carry me through his left-hand menu... but it looks to be more of a shopping site. He has posted here on SubSim several times, and has some really cool stuff, but somewhere else has the "description" of the system they used to draw those maps. I have found a better search clue here:
https://www.german-navy.de/kriegsmar.../feature6.html
so now I am off to look-up "Marinequadratkarte" and "Großquadrate"... lol
Edit: getting closer
https://de.wikipedia.org/wiki/Marinequadrat (use Translate)
http://www.uboataces.com/articles-naval-grid.shtml
but still no lat/long that they built the system from... it does get to be a real bother though (at least for me) to have to do calculation math for each coordinate you want to place in the ME... they should have made it to where you could overlay the grid in it...
