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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