Humminbird Wide Eye - Manual (Page 23)

If a target is detected between the surface and the bottom, it is displayed as a fish symbol.
Depending on the strength of the signal reflected from the object, one of three different size
symbols is used. These reflected signals are "normalized" for depth, so that a small fish does not
appear to be a large fish if it is close to the boat.
Since some species of fish tend to be better reflectors of sonar than others, the strength of return
is not always an accurate indicator of fish size, however, typically, the larger the fish, the larger
the signal return.
Additionally, since the Wide Eye uses a dual beam transducer, each of the two beams is
evaluated independently, and some directional indication is possible. If a target is seen in the
narrow beam, it is located directly under your boat, and is displayed as a solid fish symbol. If a
target is seen in the wide beam only, it can be assumed that the target is at the outside of the
sonar coverage area, not directly under the boat, and is displayed as a hollow fish symbol.
CONTROL FUNCTIONS
The Wide Eye unit uses only seven buttons to control all functions. The controls are
divided into two groups: POWER, STOP, and LIGHT are one group, and the Menu
System controls are the other group. When any button is pressed, an audible "chirp"
will verify the control input.