Humminbird 161 - Manual (Page 99)

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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 TM : QuadraBeam TM is a Humminbird® sonar configuration that uses four
sonar beams for a more detailed bottom image. QuadraBeam TM uses the DualBeam
PLUS TM 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
TM .
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