Garmin Fishfinder 160 Blue Owner's Manual - Page 38

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Garmin Fishfinder 160 Blue Owner's Manual

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On the Water

Unit Operation and the Chart

This ﬁ sh is currently in a Dead Zone and is not detected

by the sonar. The ﬁ sh is in the coverage area of the

transducer, but remember the ﬁ rst strong return sets the

bottom level. The ﬁ sh will never be detected since the

bottom level will never be set below the ﬁ sh. The ﬁ sh on

the right side of the display (shown in light grey) will be

detected and displayed when the transducer cone passes

over the ﬁ sh.

Understanding Sonar

If you are unfamiliar with sonar, or need help determining what is

displayed on the chart, then this section may be for you. This section

is intended to help the novice user gain some understanding of how the

Fishfinder 160 Blue operates and how it can help improve their fishing

productivity.

To understand what the unit is displaying, it is important to have a

general knowledge of how the unit works and how it determines what to

display. Briefly described, the unit operates by transmitting sound waves

toward the bottom of a lake, stream or seabed in a cone–shaped pattern.

When a transmitted sound wave strikes an underwater object such as the

bottom, a piece of structure, or a fish, sound is reflected back to the

transducer. The transducer collects the reflected sound waves and sends the

data to the unit to be processed and displayed on the chart. Underwater

data is displayed on the chart in the order that the reflected sound waves

are received. The diagram in the sidebar demonstrates this, showing an

underwater scene as it would be displayed on the chart. Generally speaking,

if the only thing between the transducer and a flat bottom is water, the

first strong return will come from the bottom directly below the transducer,

this return will set the bottom level. Weaker secondary returns provide

the detailed data. Stronger returns will display in darker colors, with black

being the strongest return. In Examples 1 and 2 (page 32), you can see

that the branches and the fish were the strongest secondary returns and are

indicated in black on the display.

That is a brief description of how your Fishfinder operates. Let' s take a

look at how this data can help you to improve your fishing.