Garmin GPSMAP 276C Owner's Manual - Page 98

Using the Sonar a Sonar Turned Off message appears across the Sonar

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Setting Up and Using Sonar > Using the Sonar Page Using the Sonar Page When combined with a GSD 20 or GSD 21 Sounder Module, your GPSMAP 276C becomes a powerful fishfinder/flasher. If a GSD 20 or GSD 21 is attached, but the unit does not detect a transducer, a "Sonar Turned Off" message appears across the Sonar Page. The Sonar Page appears only if a GSD 20 or GSD 21 has ever been attached or when the unit is in Simulator Mode. The middle of the page contains a right-to-left moving sonar image of the water beneath your boat. Items appear as they pass under your transducer. Those items on the right side of the screen are closer to you than those on the left. Along the right side of the screen is an adjustable scale that reflects the depth of the area being shown. The top left corner shows the adjustment option, the depth, and the water temperature. yellow (medium), green (weaker), and blue (weakest). The Fish Symbols option allows you to view the actual sonar data, a fish symbol or a combination of both. When the unit is set to Dual, the appearance of the fish symbols changes. Fish symbols from the center of the beam (200 kHz) are solid (or narrow arches), but the returns from the edges of the beam (50 kHz) are hollow (or wide arches). The sonar display can also be set to show a split screen view of a zoomed portion of the sonar, bottom lock (display scaled from the bottom up), or a combination of these options. For example, you can choose to show dual frequency at a 2X zoom (Dual 2X) on one half and normal range dual frequency (Dual) on the other half. The current display mode appears at the bottom of each sonar display. Read the "Understanding Sonar" section beginning on page 98 for more on information about sonar. Sonar Page The sonar returns show as red (strongest), then orange (strong), 90 GPSMAP 276C Owner's Manual

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Using the Sonar Page
When combined with a GSD 20 or GSD 21 Sounder Module, your
GPSMAP 276C becomes a powerful fishfinder/flasher. If a GSD
20 or GSD 21 is attached, but the unit does not detect a transducer,
a “Sonar Turned Off” message appears across the Sonar Page. The
Sonar Page appears only if a GSD 20 or GSD 21 has ever been
attached or when the unit is in Simulator Mode.
The middle of the page contains a right-to-left moving sonar image
of the water beneath your boat. Items appear as they pass under your
transducer. Those items on the right side of the screen are closer to
you than those on the left. Along the right side of the screen is an
adjustable scale that reflects the depth of the area being shown. The
top left corner shows the adjustment option, the depth, and the water
temperature.
Sonar Page
The sonar returns show as red (strongest), then orange (strong),
yellow (medium), green (weaker), and blue (weakest). The
Fish
Symbols
option allows you to view the actual sonar data, a fish
symbol or a combination of both. When the unit is set to
Dual
, the
appearance of the fish symbols changes. Fish symbols from the
center of the beam (200 kHz) are solid (or narrow arches), but the
returns from the edges of the beam (50 kHz) are hollow (or wide
arches).
The sonar display can also be set to show a split screen view of a
zoomed portion of the sonar, bottom lock (display scaled from the
bottom up), or a combination of these options. For example, you
can choose to show dual frequency at a 2X zoom (Dual 2X) on one
half and normal range dual frequency (Dual) on the other half. The
current display mode appears at the bottom of each sonar display.
Read the
“Understanding Sonar”
section beginning on
page 98
for
more on information about sonar.
¶0
GPSMAP 276C Owner’s Manual
S
ETTING
U
P
AND
U
SING
S
ONAR
>
U
SING
THE
S
ONAR
P
AGE