Humminbird Wide Vision - Manual (Page 22)

fish symbols for narrow beam returns.
The options in the Transducer menu are "Dual", which uses both transducer elements for transmitting and
receiving the sonar signals, "Narrow" which selects ments available in the Transducer menu will be "Left",
"Right", and "Both". More information about these options is discussed in "Wide Side Operation".
Sensitivity
As the Wide Vision receives returned signals, the
sensitivity of the receiver is adjusted automatically based
on a number of factors such as the depth of the water, and
the signal clarity. In murky water, full of debris, the Wide
Vision will select a lower sensitivity setting. In clear water,
where there is little debris to defract the sonar signal, the
sensitivity is set higher.
The Sensitivity menu allows you to "bias" this automatic
setting up or down based on personal preference.
You can select a bias of +5 to -5, for 11 different bias
settings. A bias setting of "0" has no effect on the
automatic function. A +3 setting selects a sensitivity setting
three steps higher than the unit would normally select, so
even the smallest returns are displayed on-screen.
A setting of -2 sets the sensitivity two steps below what the unit would normally select, so only the largest
targets or other returns are displayed.