This seems pretty useful heading into lobster season
The last few days I have spent WAY TOO much time playing with the newest update on my Navionics app. You can now shade different depths different colors. In addition to it being a trippy experience a lot of time, I can't help but think how useful this would be for lobstering, or fishing for crappie, or just trying to stay in a certain range when out on the water. It's pretty cool just to mess around. I think on this screenshot, I set it from 5-15 feet and 20-30, just to see what it looks like.