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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
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