They didn't survey the contours, so what are you saying here?
The most accurate contours of LO are the old yellow "structure graphics" maps....which are flawed drastically in areas, but still closer to accurate than anything.
There are several areas on this lake that I know like the back of my hand, and I can look at the mapping images and tell you for certain if they are accurate, or even close. Most aren't.
I'd be surprised if anyone has done a "new survey" that wasn't just an assumption made by simply continuing the contour patterns out from the surrounding dry land, then adding in what OLD SURVEY material indicates.
I understand that is hard to come to grips with after spending hard earned cash on that software .....but I'm afraid that is a fact. Accept it and learn, or deny it and stay ignorant. It's your choice.
I'm not saying that the software isn't any good, or that it isn't useful, but it's no better than the old yellow POS maps.