Bottom Discrimination Display - Furuno NavNet TZtouch3 Series Operator's Manual

7. FISH FINDER (SOUNDER)
7.3.5

Bottom discrimination display

The bottom discrimination display, which requires a bottom discrimination capable
transducer or Bottom Discrimination Sounder BBDS1 or Network Fish Finder DFF1-
UHD, identifies probable bottom composition. The display is available in all screen di-
visions, single or dual frequency mode, and occupies the bottom 1/6 of the screen in
the full screen display.
Use this feature with ship speed 10 knots or less and depths between 5 and 100 m.
Note 1: Composition estimate accuracy may be affected when the transducer is not
parallel with the seabed.
Note 2: Picture advance speed become slow while the bottom discrimination display
is active.
Bottom
discrimination
576
display
Sand and rock are the most likely bottom type in this example.
How to activate or deactivate the bottom discrimination display
1. Open the Home screen, then tap [Settings]→[Fish Sounder].
2. Tap [Fish Finder Source].
3. Tap [TZT12F], [TZT16F], [TZT19F], [BBDS1] or [DFF1-UHD] as applicable.
4. Tap the close button on the title bar to finish.
5. Turn [Bottom] on or off from the [Layers] menu.
How to display bottom discrimination display information
Tap the bottom discrimination dis-
play to show bottom discrimina-
tion information, an example of
which is shown right.
The bottom discrimination display
can be turned off from the pop-up
menu with [Bottom].
7-6
m
LF/HF
50/200 kHz
Rock Gravel Sand
The percentage of
main bottom type
is also displayed in
the graph.
Reliability bar
Reliability of
bottom discri-
mination display
shown with colors.
- Green: Normal
- Yellow: Caution
Mud
- Background color:
Abnormal