unit sounds complicated.lots going on for an ice fishing flasher or graph.
It's not at all complicated.
I run 4 screens for ice fishing and hide the rest. 1 standard graph screen, 2 standard graph and zoomed graph split screen, 3 circle flasher screen, 4 GPS screen. If I remember correctly you adjust the zoom by bringing up the zoom screen and adjusting it through the menu button options. I can double check when I get home from work