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If you are fishing deep water with a sloping bottom with a 19 degree transducer the edge of the cone will strike the side of the slope and that is what registers on your fish finder.
Your lure may be 5 or 6 feet futher below and you can not see it on your finder.
If you have a 9 degree transducer is still does that but the circumference of the 9 degree is smaller and therefore the cone angle does not hit so high up on the sloping bottom.
I have 2 with my vex,when I go to Granby where I will be fishing 35 + I will always take the 9 degree.
 
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