Humminbird 141c

Maximum Depth Menu: The Maximum Depth Menu is a Humminbird® feature that

optimizes performance based on the maximum operational depth set by the user. Many

Humminbird® units can operate across a very broad depth range (up to 2500 feet)

which causes the unit to "look" up to that full depth under some circumstances. Due to

the speed of sound in water, this can result in less responsiveness because the unit has

to wait for a longer period of time to receive the sonar signal. When the Maximum

Depth menu is set to a lower value, the unit only looks up to the setting, which increases

the responsiveness of the unit. This is an important feature for anyone operating in

shallower depths!

Noise: Noise is unintentional, external sound waves that interfere with the optimal

operation of sonar. Noise appears as random "dots" on the display, and is caused by a

variety of sources. Electrical noise (from trolling motors, bilge pumps, VHF radios)

typically manifests as a consistent dot pattern. Electrical noise can be isolated by

selectively turning on and off other electrical devices to determine the source. Often re-

routing the power cable, or connecting to an alternative power supply (second battery)

can help overcome electrical noise. Hydrodynamic noise (from propeller and/or hull

cavitation) has a more random appearance and is generally related to boat speed, so

that faster operation results in more noise. Hydrodynamic noise can be overcome by

proper transducer installation. Many Humminbird® products have a Noise Filter menu

setting that allows the user to clear the screen of noise that is difficult to eliminate.

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. SeeChart 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.

All cable connections are made when installing, so that no separate wiring connections

are required. Additionally, the mount offers 90° tilt and 360° swivel capability to adjust

the viewing angle of the unit as you move about the boat.

Real Time Sonar:Real Time Sonar is a Humminbird® technology that delivers ultra-fast

sonar transmitter/receiver operation and results in a more detailed instantaneous view

of what is under the boat. The Real Time Sonar window is a vertical band at the right side

of the display that shows the instantaneous sonar return from the transducer at a

particular instant. The RTS® Window menu option permits the user to adjust the

window to show the full sonar signal return, or just a narrower band that indicates

intensity using grayscale. Real Time Sonar relies on very fast Sonar Update Rate (Ping

Speed). See Sonar Update Rate.

Receiver:See Transmitter.

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