Super User iceintheveins Posted September 13, 2018 Super User Posted September 13, 2018 There are three settings on my Humminbird for the DI (narrow, medium and wide beam). Someone told me 455khz is the best for down imaging most of the time except in really deep water. What beam angle do you guys use for best results and which beam is 455 khz. Default is wide and it says 455/520khz on the display. Quote
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