Humminbird 757c - Manual (Page 153)

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Chart Speed: Chart Speed is a user-controllable feature that sets the speed at
which sonar information moves across the display. A faster setting displays
sonar information from more pings and shows more detail, but the information
moves quickly across the display: a slower setting permits viewing of more
sonar history, but does not display as much detail. The best setting is often the
user's personal choice.
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 receives the sonar
signal 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.
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