Furuno tztl15f Manual De Usuario

7.  FISH FINDER (SOUNDER)

The dual frequency display provides both low and high frequency pictures, the low fre-
quency on the left half (default). Use the dual frequency display to compare the same 
picture with two different sounding frequencies.

Tap the screen to show the pop-up menu. Tap [Mode], [Dual Freq.].

Zoom mode expands selected area of the single frequency picture. Two modes are 
available: bottom lock and bottom zoom.

Tap the screen to open the pop-up menu. Tap [Mode], then tap [Bottom Lock] or [Bot-
tom Zoom]. To quit the zoom display and go to the single frequency display, tap 
[Mode], [Single Freq.] on the pop-up menu.

The bottom lock display provides a compressed normal picture on the right half and a 
7 to 400 feet (2 to 120 meter) wide layer in contact with the bottom is expanded on the 
left half. This display helps you separate the fish near the bottom from the bottom 
echo. You can select the bottom lock range with [Bottom Lock Range Span] in the 
[Settings] - [Sounder] menu.

Low

frequency

High

frequency

Freq. 
(kHz)

Low

High

Beamwidth Resolution

Detection 
range

Bottom 
tail

Wide

Narrow

Low

High

Deep

Shallow

Long

Short

 ft

LF/HF

40.4

Zoomed 
school of fish

Bottom lock display

Single freq. display

Zoom marker

School of fish

This area zoomed 
and displayed on 
left 1/2 of screen.

Bottom shown as a straight line

 ft

  BL/LF

40.4