Humminbird Marine GPS System GPS User Manual

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Down Imaging™ Sonar
(561 DI, 570 DI, and 571 HD DI)
The 561 DI, 570 DI, and 571 HD DI
Fishfinders use 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 Sonar Menu Tab:
Imaging Frequency for more information.
The transducer also uses conical beams to
provide data in traditional 2D format (see
What’s on the Sonar Display). 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
How Sonar Works

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