Originally Posted by
Matt_Magnone
Was pure line of site and landmarks.
I've studied damn near every inch of that lake with maps, sonar and time on the water. The only way I was able to find the ledges was cross referencing photos and line of site from my gps coordinates on my boat, google earth and then topo maps I have. It put me in a general vicinity then all I had to do was put the casts out there to map the bottom. I messed up and blew out a couple areas because I was a little too close but it worked out fine because I could cycle back through.
One thing on DVL is the bird life tells the story and lets you know the depth. Warching certain birds stay in a general vicinity gave me clues on water depth and type of bottom. Staying just outside their range put us in the deeper water and outside the ledge. No clue on exact depth, but I believe it was that 30-40' type stuff. For all I know it could have been 20.