Manual Garmin gps map276 (page 106 of 134) (English)

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Understanding Sonar

The transducer mounted on your vessel transmits sound waves

toward the bottom of the water in a cone-shaped pattern. When

a transmitted sound wave strikes an underwater object—such as

the bottom, a structure, or a sh—sound is reected back to the

transducer. The transducer collects the reected sound waves and

sends the data to the GSD 20 or GSD 21 Sounder Module and then

to the GPSMAP 276C to be processed and shown. The underwater

data is shown on the Sonar display in the order that it is returned;

rst returned is the rst on the display.

Sonar Page

If the only thing between the transducer and the bottom is water,

the rst strong return comes from the bottom directly below the

transducer and sets the bottom level. Weaker secondary returns

provide the detailed data. Stronger returns show in darker colors,

with red being the strongest.

Understanding the Sonar Display

One of the rst things to understand about sonar is that the

transducer sends a beam down to the bottom of the water, much like

the beam of a ashlight. The beam starts small near your vessel and

expands as it gets to the bottom. See “Transducer Coverage” for

more detailed information.

The Sonar Page does not show a three-dimensional representation of

the underwater environment; the display is in two-dimensions, much

like if you took a picture of an aquarium. Only the depth of the item

in the water appears. The Sonar display does not show you where an

item is located horizontally in the water, as shown in the drawings

below. The sh is not directly above the tree in reality, but it might

look like it is on the Sonar Page.

20'

10'

Aerial View of the Water Sonar Display

Fish

Tree

98 GPSMAP 276C Owner’s Manual

settIng uP And usIng sonAr > understAndIng sonAr

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Garmin gps map276 Manual

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