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Glossary
Sonar Terms:
Alarm, Depth: Depth Alarm is a user-controllable, audible alert that sounds when depth
is less than or equal to the setting.
Alarm, Temperature: Temperature Alarm is a user-controllable, audible alert that sounds
when the water surface temperature equals the setting.
Backlight: Backlight is a user-controllable illumination for the LCD for night and low
light use.
Beam (Sonar Beam): A sonar beam is the cone-shaped projection of sound waves formed
as sound travels underwater. See Cone Angle.
Big Digits View: Big Digits View is a Humminbird® feature that displays the sonar graph
and enlarged digital readouts for easy reading from a distance. This is a great tool when
monitoring the digital depth is important - such as with higher boat speeds, or when
viewing the unit from a distance. When speed input is available, the Big Digits View also
shows the TripLog. See TripLog.
Bottom Black: Bottom Black is a Humminbird® feature that "fills in" the area of the display
below the bottom contour. Bottom Black is preferred by some anglers because of its high
contrast and easy readability, even though it can obscure bottom hardness information.
Bottom Contour: Bottom Contour is the profile of the bottom graphed to the display as
the depth changes.
Bottom Hardness: Bottom Hardness is the density (or composition) of the bottom, which
can often be determined by interpreting the main sonar return. Varying levels of hardness
can be determined by interpreting the "thickness" of the sonar return. Hard returns appear
thin and black, softer returns appear thicker and less black. It is important to note that a
sonar return from a sloping bottom can have the appearance of a softer bottom.
Cavitation: Cavitation is the effect of air bubbles created as the propeller rotates and the
boat moves through the water.
Chart Speed: Chart Speed is a user-controllable feature that sets the speed at which sonar
information moves across the display. A faster setting displays sonar information from
more pings and shows more detail, but the information moves quickly across the display;
a slower setting permits viewing of more sonar history, but does not display as much
detail. The best setting is often the user's personal choice.