I have a fish symbols turned off on my Fishfinder/Sounder. Why don I get any arches?
A. When the Fish ID is turned off, you will see an actual representation of the sonar echo. The sonar pulse is a convex wave that goes out of the transducer. The only way the unit will show a perfect arch or half moon is if the fish enters the front of the cone, goes straight toward the center and out the back. This would cause the echo to get closer toward the center, causing the arch. If a fish enters the cone and goes out the side, you may get a partial arch or just a black spot on the screen. When using the unit with the Fish ID off, set the gain to around +2 and use the split-screen zoom to make it easier to see the fish (although you still may not see a perfect arch).
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