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Pixels: Pixels are the "picture elements", or small square blocks, that make up the
image on the LCD. Measured as a vertical by horizontal number (i.e. 640V x 320H),
this key specification typically indicates the quality of resolution. In fishfinders, the
total resolution (vertical multiplied by horizontal) is often less important than the
"Vertical Pixel" resolution. See Pixels, Vertical.
Pixels, Vertical: Vertical Pixels are a number of vertical picture elements in a single
column on an LCD display. More vertical pixels provide finer resolution of targets
detected by sonar. Essentially, a vertical distance (the depth), when divided by a
larger number, breaks that distance into smaller samples, each representing a
smaller area and thus providing more detail. In fishfinders, vertical pixels are more
critical than horizontal pixels because the horizontal axis of the display represents
time, or history. Sonar information on the horizontal axis can vary greatly,
depending on boat speed and the Chart Speed setting. A greater number of
horizontal pixels show more sonar history that the boat has passed through. On
many models, Humminbird® provides the most vertical pixels to provide a better
display resolution. See Chart Speed and Pixels.
Power Output: Power output isthe amount of soundenergy emitted intothe water
by the sonar transmitter. Power output is measured using either RMS (Root Mean
Square) or P-T-P (Peak-to-Peak) measurement systems. Either method is acceptable,
but it is important, when comparing power outputs, to make sure that the same
measurement system is being used for both outputs, because P-T-P numbers are 8
times higher than RMS numbers. Greater power output allows the sonar signal to
penetrate through weeds andthermoclines, reach deeper depths and operatemore
effectively in noisy environments, such as when the boat is running at high speed.
Pulse Width (Pulse Length): Pulse Width is the length of time that a sonar sound
burst is transmitted into the water. Shorter pulse widths provide better target
separation, but cannot travel to great depths. Longer pulse widths provide better
depth penetration, butresult inpoorertarget separation.Humminbird® variespulse
width based on depth to optimize both target separation and depth performance.
See Target Separation.
QuadraBeam™: QuadraBeam™isa Humminbird® sonarconfiguration thatusesfour
sonar beams for a more detailed bottom image. QuadraBeam™ uses the DualBeam
PLUS™ configuration for downlooking, and also adds two additional beams to look
to the left and right. The sonar beams pointing to the left and right provide the