I "think" I have the latest update. In the unit itself, it shows software version 3.500(9/13/19 10:1, but the latest on Humminbirds site is v.2.180. I tried to load v2.180 into the unit, Helix 12 Mega DI G3N, but it said I have the latest! I don't get it. Bottom line is, I don't have the Water Column Sensitive feature! Help! (sorry about the photo turned sideways, the site wouldn't let me delete and replace it)