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I turn up the gain just enough so my jig shows up as a thin green line. I try to keep the gain low as possible.
I do believe as you go deeper you want to use the wider cone angle 12 or 20 that way you see more as it gets deeper
So to go a step further, and I dont mean to highjack your thread, my Vexilar FL 12 has 3 beams 8,12,20 and I have ALWAYS (only 2 years) used it on 12....when should I use the other two? What exactly does it do? I havnt seen much info on this.thanks so much for help.
Actually it is the opposite of that. Deeper you go the lower degree setting you want. I wouldn't use 8º unless I was fishing over 40 ft.