Echo History Display; How To Balance Echo Strength - Furuno NAVnet TZtouch2 Operator's Manual

7.9

Echo History Display

You can view past echoes which are off the screen. Swipe the screen to the right to
display past echoes. To return to the active display, tap [Cancel Hist] at the top right-
hand corner of the screen.
7.10

How to Balance Echo Strength

Depending on local ultrasound characteristics, the reflection from a school of fish in
deep water may appear in weaker colors than that from a school in shallow water even
though their strengths are equal. To show the schools of fish in equal strengths (col-
ors), use the TVG. The TVG can be adjusted according to water depth*, TVG level so
that echoes of the same strength at different depths are shown in the same colors.
* DFF-3D only.
In the illustration shown below, for example, the TVG is set for 300 ft and the TVG
level is adjusted.
Note: This function is not available in the auto mode.
1. Open the home screen, then tap [Settings] - [Sounder].
2. Drag the slider in [TVG HF] (high frequency) or [TVG LF] (low frequency) to set
the level. The menu item on the DFF-3D is "[TVG]". The TVG setting method
changes with the fish finder connected.
Internal sounder (For TZTL12F, TZTL15F
or TZT2BB), DFF1, DFF1-UHD, BBDS1,
DFF-3D
DFF3
3. For DFF-3D, tap [TVG Distance], and the software keyboard appears. Set the ef-
fective TVG distance desired, then tap [].
4. Tap the close button to finish.
0 ft
300 ft
Echoes of the same size
are displayed in different
sizes and colors
depending on depth.
Fish finder
7. FISH FINDER (SOUNDER)
0 ft
300 ft
Echoes of the same size
are displayed in same
sizes and colors.
TVG setting method
The higher the setting the greater
the distance gain.
The higher the setting the lower
the distance gain.
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