Zoom Displays - Furuno NavNet TZtouch3 Series Operator's Manual

7. FISH FINDER (SOUNDER)
7.3.3

Zoom displays

Zoom mode expands selected area of the single frequency picture. Two modes are
available: bottom lock and bottom zoom.
How to activate, deactivate a zoom display
Tap the screen to open the pop-up menu. Tap [Mode], then turn on [Bottom Lock] or
[Bottom Zoom]. To quit the zoom display and go to the single frequency display, open
the pop-up menu, tap [Mode], then turn on [Single Freq.].
Bottom lock display
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
[Fish Finder] menu.
Zoomed school
of fish
Bottom zoom display
The bottom zoom display expands the bottom and the fish near the bottom according
to the zoom range selected on [Zoom Range Span] in the [Fish Finder] menu. This
display helps you find the density of the bottom. A short echo tail normally indicates a
soft bottom (sand bottom, etc.). A long echo tail indicates a hard bottom.
Bottom zoom display
Bottom
20.5
7-4
Bottom lock display
m
20.5
BL/HF
200 kHz
Bottom shown as a straight line
Single freq. display
m
BZ/HF
200 kHz
Single freq. display
Zoom marker
Zoom marker
automatically
follows change in
depth.
School of fish
Zoom marker
This area zoomed
and displayed on
left 1/2 of screen.