I have a Lawrance, HDI unit from 2013. Not sure what the settings are but it does show small arches all along the bottom when n a Scholl is present. Mine is set for color changes by the previous owner. Small fish are black specs bigger fish show arches and big fish get red in color. Easy to see bigger fish mixed in with small fish from the marks and colors. How to create this....I have no idea, owned this unit for 3 years and still learning, then again, computers and I don't get along well !