McKenzie, MN DNR (lakefinder), or Voyaguer Maps are the only paper map sources for the BWCAW that have lake contours. I don't think either of them have specific GPS coordinates.
If you look below on some of the recent posts you can find some mapping and GPS overlays.
This is a photo of my Lowrance MN Lakemaster 2009 chip of a spot on Northern Insula. I have an Ifinder ExplorerC--never used it in the BWCAW bought the chip for fishing MN lakes but nice to find most of the campsites, portages, lake contours are marked as well. FYI only the 2009 chip ha the BWCAW info.
Partial zoom close to Williamson Island
GPS Info