I've found this forum on zapping the web, but I sow on it aren't any topic about kriegsmarine maps.
I've published my collection (about 150 maps & atlases) on www.kartengruppe.it
If you're interested visit it and, please, help me on google-rating with a click on the "+1" on the top/right of the home page.
I hope you'll like it. All the suggestion are agree.
... & have fun!