Most fish electronic units have a 20 degree cone angle. This means the circle of sound covers an area about one third of the water depth--Example: in 30 feet of water the circle of sound would have approximately a 10 foot diameter.
If your sensitivity is set too low, you will not see fish that are in the edges of your beam. In other words, your cone angle is then less than 20 degrees. Most units are capable of displaying targets down to 100 feet or more. I usually have my sensitivity set around 50 to 60 percent in depths of 25 to 50 feet, and have no trouble seeing fish. In very shallow water, turn it lower or the whole screen will be distorted. That is just common sense.
In the auto mode, the unit will turn the sensitivity lower if the bottom is hard. That, in effect, will weaken the cone angle. That is only one reason you should run on manual mode.
Next week--more on electronics.
Cone Angles and Sensitivity Control
Use manual mode and common sense
October 4, 2009 at 2:38PM
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lrbjwb
It’s too soon to tell how much the immigration crackdown is to blame.
