using SI & GPS to create 3d lake maps

[doc]

Has anyone heard of drdepth software, I was browsing the Humminbird SI forums and came across a post of a gentleman posting Screen Shots of portions of the lake he fishes. I've only been looking at it a few minutes but from my understanding you can take recorded gps & si data feed it to this mapping software and create a 3d image with contour lines, and colors for bottom hardness of the area of water you recorded, then on your next outing do a different track of water, come back and compile the new data and add to your existing map. So eventually one could create a full 3d map of a home lake or more specific pieces of structure, and/or create google maps overlays

Come on NoFear I wanna hear your input on this one.