Thanks to everyone who has posted. I appreciate the up to date info-the whole idea was not to put the Lund into the rocks.I hope this will help others also.

My 06 navionics chip last fall on Mille Lacs had my position on the highway when I was trolling in 8ft. of water, I now have a Lakemaster chip for Minnesota. This last weekend I was on Big Creek lake in central Iowa sitting in 20ft of H2O navionics had me on the beach. I can’t wait until Lakemaster has a chip for central and southern IA.