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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. A greater number of 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 is the amount of sound energy emitted into the 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 and thermoclines, reach deeper depths and operate more 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, but
result in poorer target separation. Humminbird® varies pulse width based on depth to
optimize both target separation and depth performance. See Target Separation.
QuadraBeam™: QuadraBeam™ is a Humminbird® sonar configuration that uses four
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 ability to
spot fish and structure over a wide 90° area, and to identify on which side of the boat
they are located. See DualBeam PLUS™.
Quick Disconnect Mount: The Quick Disconnect Mounting system is an exclusive
Humminbird® feature that permits the unit to be easily removed from the mounting
base by pressing a release button, and re-installed by simply snapping it back into place.