Garmin GPSMAP 392, 398, 492, 498, Руководство пользователя

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84 GPSMAP 392/398/492/498 Owner’s Manual
U
SING
S
ONAR
> F
LASHER
P
AGE
Flasher Page
The Flasher page provides an almost instantaneous return of what
is below your boat. This page can show depth, fish, bottom content,
and structure. When you use the Flasher page, you can adjust
the Range, Gain, Color Gain, Frequency, and Scroll settings. See
page 79 for information about these settings and how to change
them.
Flasher Page
Understanding the Flasher Page
The most intense, constant signal on the Flasher Page is the actual
depth and bottom:
• A
soft bottom
(such as silt or mud) creates a signal that is
narrow and more faint.
• A hard bottom (such as sand or rock) creates a signal that is
wider.
The colors indicate the different strengths of the signals. If you
understand a bit about how sonar works, you can better understand
what you see on the Flasher Page. Remember, three-dimensional
space is appearing on a two-dimensional screen. The circular area
of the bottom becomes a wide mark on the screen and fish inside
the transducer beam can be any color and in any position, including
inside and beyond the bottom mark. The colors indicate the
different strengths of the signals. This can be roughly correlated to
a position inside the beam. Red being the center most part, orange
the area around, and green the outer edge of the beam. Targets (for
example, fish) with larger surface area appear more red; and targets
with less surface area appear orange, and green for the smallest
items.