Interpreting The Display - Furuno TZTL12F Operator's Manual

7. FISH FINDER (SOUNDER)
[Set Hardware to Factory Default]: Select this menu item to restore default settings
for the unit selected in [Fish Finder Source].
[Reset Default Settings]: Select this menu item to restore default settings for the
[Sounder] menu.
7.16

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.
Second
bottom echo
7-20
Range shifted
Difference in depth
Zero
line
Difference in sensitivity