Name:   Talullahhound - Subject:   Mapping of the lake Date:   7/24/2018 11:03:06 AM

I got one of those letters when I had my dock clad in composite - didn't change a thing about the dock except its surface.  

There are a lot of companies now that sell maps of various lakes, so it may be one of those.  I know there is one company that sells a wooden map that shows the depth of lakes at various points.