Introduction
3
DualBeam PLUS™ Sonar
(DualBeam PLUS™ models only
[858c HD, 898c HD SI, 958c HD, & 998c HD SI])
The
858c HD/958c HD Combo
and
898c HD
SI/998c HD SI Combo Fishing Systems
use
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.
Down Imaging™ Sonar
(Down Imaging™ models only [858c HD DI
and 958c HD DI])
The
858c HD DI/958c HD DI Combo
Fishing System
uses Down Imaging™
technology.
The
Down
Imaging™
transducer scans the water with razor-
thin, high-definition beams. The beams
are wide (side to side) but very thin front
to back.
The Down Imaging™ beams can be
operated at two frequencies: 455 kHz
(75°) or 800 kHz (45°). Select 455 kHz for
the best overall image quality and depth.
Select 800 kHz for the sharpest image.
See
Down Imaging™ X-Press™ Menu:
Imaging Frequency
for more information.
The transducer also uses conical beams to provide data in traditional 2D
format (see
What’s on the Sonar View
). Select 455 kHz for a narrowly
focused 16° center beam, or select 200 kHz for a wider 25° beam (see
Sonar
Menu Tab: Beam Select
).
Depth capability is affected by such factors as boat speed, wave action,
bottom hardness, water conditions, and transducer installation.
75 Degree Total Coverage
16°
75°
25°
455kHz
200kHz
455kHz
45°
800kHz
Summary of Contents for 858 HD DI
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