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7. FISH FINDER (SOUNDER)
7-20
7.15 Interpreting the Display
Zero line
The zero line (transmission line) shows the position of the transducer. The line disap-
pears from the screen when the range is shifted.
Bottom echoes
The strongest echoes are from the bottom, and are normally shown in reddish-brown
or red. The colors and the width change with bottom material, depth, sea condition,
installation, frequency, pulse length and sensitivity.
Zero
line
Range shifted
Second
bottom echo
Difference in sensitivity
Difference in depth