Wow, that will be a big Treasure.
Mmh, while searching this, i found at the Site of the National Library of Australia the Uboothandbuch of the East Coast of North America online:
http://memory.loc.gov/cgi-bin/query/r?ammem/gmd:@field(NUMBER+@band(g370932cm+gct00203))
With Maps in it. Free Download, one Map has 18 MB. Perhaps you will need a jpg2000 Plugin.
Small Detail:

Thanks Astralia!