Furuno tztl15f Manual De Usuario

7.  FISH FINDER (SOUNDER)

The zero line (transmission line) shows the position of the transducer. The line disap-
pears from the screen when the range is shifted.

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