THe WI DNR website over the years has provided fisherman with a large # of lake depth maps...in both "pdf" and "gif" format.
THe "gif" format was the best...as you could use the Paint program on your computer to "crop" them....doing away with unnecessary info and empty space.
But now...in their glorious decision making...have decided to only support the "pdf" format.
Life Member David BB Linkmeister
US Army '78-'85 West Central Wisconsin