What's up SUF fam. I recently went fishing with my Omnia app. I don't have any electronics so it shows me water depth and underwater contour changes. I had to break out my " Knockoff Nalgene bottle tote'n wanna be environmental science major days" to remember how to read the contours.
So, I thought not everyone may understand what they are looking at. On the 3D image pics you can mentally flip the image and imagine it as a hole or valley or you can imagine it covered in water as a cliff or mound all depending on the depth number listed on the contour line... The main thing to remember is... The closer the lines the steeper the slope like a ledge and the further the lines the more gentle the slope. Hope these help...