Furuno NAVnet TZtouch2 Operator's Manual page 195

7. FISH FINDER (SOUNDER)
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 [Settings] - [Sounder] menu.
This display helps you find the density of the bottom. A short echo tail normally indi-
cates a soft bottom (sand bottom, etc.). A long echo tail indicates a hard bottom.
Bottom
7-4
Bottom lock display
( S ) ft
40.4
BL/LF
Bottom shown as a straight line
Bottom zoom display
( S ) ft
40.4
BZ/LF
Single freq. display
Single freq. display
Zoom marker
School of fish
Zoom marker
This area zoomed
and displayed on
left 1/2 of screen.
Zoom marker
automatically
follows change in
depth.