Most fish appear as "arches." This happens because the fish enters the edge of the sonar cone (distance is long), moves to the center (distance is short), and leaves (distance is long again).
If your screen is too cluttered with "noise" (specks), turn this down. If you can't see your lure, turn it up. 0a67281350343620.jpg
Replaces arches with little fish icons. While easier to read, it is often less accurate than manual interpretation. Most fish appear as "arches