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It could be a few things. Bouncing off a nearby rock, could be on a drop off, or you could be above a really steep angle which would read only the shallower part of the angle.
Thanks to all for your suggestions. Much appreciated. Will check to make sure transducer is hanging level etc. Sounds like my lure is in the dead zone ( great article - thx). Right now hut is situated on a drop off. Will be moving it tomorrow - so will see if this helps. Might need to see if there is a narrow beam transducer available for this model. Thanks again for the comments.
Yes, you should be able to switch the transducer from wide angle to narrow, changing the cone size, using the "beam" button.
I can read through a dead zone with my marcum lx7 ,and my helix 5 takes a little getting use to and that’s on graph mode , I could never read through it with my vex nor my older lowrance