Humminbird 141c

from an object meets strict parameters, the unit draws a Fish Symbol (or icon) and the

digital depth of the target. On DualBeam and DualBeam PLUS™ units, fish detected in

the narrow center beam are shown as shaded symbols, and fish detected in the wider

beam are shown as hollow symbols.

Fish Symbol: A Fish Symbol is the graphic that is displayed on the screen when Fish ID+

determines that a sonar return is likely to be a fish. See Fish ID+.

Freeze Frame: Freeze Frame is a Humminbird® feature that pauses the sonar scrolling so

that the image on screen can be studied with greater detail. See Instant Image Update.

Frequency:Frequency is a measure of the number of sound wave cycles per second of

a sound impulse transmitted underwater. A typical frequency for fishfinders is 200

kHz, which offers a good balance of performance under many conditions. Lower

frequencies, such as 50 kHz, are capable of penetrating to greater depths, but with less

resolution. Higher frequencies, such as 455 kHz, offer greater resolution, but are limited

in depth performance. Humminbird® uses a variety of frequencies that are optimized

for specific applications.

Grayscale:Grayscale is the use of varying shades of gray to represent the strength of the

sonar signal on the display, and is a very intuitive method of presenting information.

Traditionally, the strongest sonar signals are represented in black, and progressively

weaker signals are represented in progressively lighter shades of gray.

Grayscale, Inverse: Inverse Grayscale is a Humminbird® feature that reverses the

correlation of sonar signal strength and the shade of gray typically used to represent it.

The strongest sonar signals are represented by "white", and progressively weaker signals

are represented in progressively darker shades of gray. While somewhat counter-intuitive,

this method makes the sonar images crisper, and has the benefit of enhancing the

apparent sensitivity because the weaker signals appear bolder. Inverse grayscale works

well in very clear water. Debris-laden water often appears as a lot of clutter on the screen.

Instant Image Update:Instant Image Update is a Humminbird® feature that updates all

the sonar information on the display when Sensitivity and a variety of sonar settings

(Bottom View, Range, etc.) are modified. This differs from the traditional functionality

that only updates the new sonar information collected after the setting change. Instant

Image Update permits more accurate fine-tuning of the display because the user can see

the results on the complete sonar graph. When combined with the Freeze Frame

feature, the user can adjust and understand the effects of many different sonar settings

quickly and easily.

Cone Angle: The cone angle is the angular measurement of the sonar beam at a specific

dB down point (i.e. -10 dB). See dB Down Point.

Customizable Digital Readouts: Customizable Digital Readouts is a Humminbird®

feature that permits the user to select the specific digital information that appears in

the main Sonar view (i.e. Speed, Temperature, Barometric Pressure, TripLog, etc.)

Dead Zone: The dead zone is the area of the sonar beam that is received after the main

bottom return. Fish and other objects close to the bottom that fall within the dead zone

will probably not be visible in the sonar beam. Precision sonar beams, such as the

Humminbird® 20° beam, have a smaller dead zone than wider sonar beams.

Decibel: A Decibel is the measurement for sound pressure level, or "intensity" of the

sonar return. See dB Down Point.

dB Down Point:The dB Down Point is the standard decibel level at which the sonar cone

angle is measured, and is written as "@ -10 dB" or "@ -3 dB". Measurements at smaller

down points (bigger negative numbers) indicate that the less intensive sonar signals are

being used for the measurement.

Display, FSTN:FSTN is an acronym for Film Super-Twist Nematic. FSTN is a monochrome

display technology characterized by black, high-contrast pixels. All monochrome fixed

mount Humminbird® products use FSTN technology.

DualBeam PLUS™:DualBeam PLUS™ is a Humminbird® sonar configuration that uses

two sonar beams simultaneously, and combines the information from both beams into

one view by overlapping the data on-screen, or shows each beam individually side by

side, or permits each beam to be viewed individually full screen.

Feature Memory: Feature Memory is a Humminbird® feature that retains the user's

menu settings in permanent memory. Settings are retained even when the unit is

powered off indefinitely.

Fish Arch: A Fish Arch is the apparent "arch" that appears on the display when any object

moves through the sonar cone. The arch results from a gradual decrease in distance to

an object as it moves into the sonar cone. The distance to an object changes due to the

conical shape of the sonar beam, which causes the distance to be greater at the edges

of the beam than at the center of the beam. When this distance change is graphed on

the display, an arch appears.

Fish ID+™: Fish ID+™ is a Humminbird® feature that uses advanced sonar processing

algorithms to determine if a detected object is likely to be a fish. When the sonar signal

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