Humminbird Fish Finder 409000-1 User Manual

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Introduction
3
DualBeam PLUS™ Sonar
(858c, 898c SI, 958c, 998c SI)
The Fishing System uses a 200/83 kHz
DualBeam PLUS™ sonar system with a wide
(60°) area of coverage. DualBeam PLUS™
sonar has a narrowly focused 20° center
beam, surrounded by a second beam of 60°,
expanding your coverage to an area equal to
your depth. In 20 feet of water, the wider
beam covers an area 20 feet wide.
DualBeam PLUS™ sonar returns can be
blended together, viewed separately, or
compared side-by-side. DualBeam PLUS™ is
ideal for a wide range of conditions - from
shallow to very deep water in both fresh and
salt water. Depth capability is affected by
such factors as boat speed, wave action,
bottom hardness, water conditions, and
transducer installation.
QuadraBeam PLUS™ Sonar
(optional-purchase QuadraBeam PLUS™
transducer only)
Your Fishing System supports the
optional-purchase QuadraBeam PLUS™
transducer. QuadraBeam PLUS™ sonar
provides a wide (90°) area of coverage.
QuadraBeam PLUS™ starts with two
fan-shaped 35° 455 kHz Side Structure
locating sonar beams to spot fish, bait,
and structure to the left and right of the
boat over an area of the bottom that’s
always equal to twice your depth.
For a detailed view below the boat,
QuadraBeam PLUS™ uses DualBeam
PLUS™ technology, with precision 20°
and wide 60° beams. QuadraBeam
PLUS™ finds more fish faster, and can
even tell you where to put your bait by
showing if fish are to the left, right, or
directly beneath your boat.
90° Total Coverage
BottomCoverage
=
2 xDepth
35° 60° 20° 35°
455 kHz 455 kHz
83 kHz
200 kHz

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