Relief shading (also called hillshading) is a visualization technique that uses light and shadow to reveal the three-dimensional structure of underwater terrain. Unlike flat nautical charts, relief shading makes depth contours, ledges, drop-offs, channels, and other bottom features instantly visible.
Fish Fathom uses high-definition relief shading data that far exceeds the grainy, pixelated maps found in competing apps. Our HD relief shading reveals bottom structure with incredible clarity, allowing you to identify productive fishing spots that others simply cannot see.
When you can clearly see the terrain, you can target fish habitat with precision. Rocky outcroppings, steep ledges, sand channels through reefs, and subtle depth changes all become obvious at a glance. This is the difference between fishing blind and fishing smart.
