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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+™ isa Humminbird®feature that usesadvanced sonar processing
algorithms to determine if a detected object is likely to be a fish. When the sonar
signal froman object meetsstrict parameters, theunit drawsa Fish Symbol(or icon)
and the digital depth of the target. On DualBeam and DualBeam PLUS™ units, fish
detectedin thenarrow centerbeamare shown asshadedsymbols, andfish 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 wavecycles per second
of a sound impulse transmitted underwater. A typical frequency for fishfinders is
200 kHz,which offersa goodbalance ofperformance undermany conditions.Lower
frequencies, such as 50 kHz, are capable of penetrating to greater depths, but with
less resolution. Higherfrequencies, such as455 kHz,offer greater resolution, butare
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 arerepresented in progressively lighter shadesof gray.
Grayscale, Inverse: Inverse Grayscale is a Humminbird® feature that reverses the
correlation ofsonar signalstrength andtheshade ofgray typicallyused torepresent
it. The strongest sonarsignals 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