You can try it yourself (jsgme-ready):
http://dl.dropbox.com/u/4055585/Real%20map%20colour.rar
Please help if you have some knowledge about those maps so we can make a realistic map for sh3.
In this post you can find kriegsmarine maps:
http://www.subsim.com/radioroom/show....php?p=1259825
And another site:
http://www.kartengruppe.it/
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If you wish to do it yourself the only file that you must edit is data/terrain/pal/Terrain.act
There must be some simpler method to edit this file, but I do it by opening e.g. 4320_2160.raw in Photoshop, then Image>Mode>Grayscale, then Image>Mode>RGB Color, then Image>Mode>Indexed Color..., then in the window that opens Palette>Custom..., then Load and point to Terrain.act file - then in the same window you can edit the colors and save a new Terrain.act file. Thats it.
One more thing - remember that you can make subtle changes to map colour by changing colours of StrTactMap.tga