How To Select The Range; How To Adjust The Gain; Automatic Gain Adjustment - Furuno NAVNET TZ2 TZTL12F Operator's Manual

How to display bottom discrimination display information
Tap the bottom discrimination dis-
play to show bottom discrimination
information, an example of which is
shown right.
The bottom discrimination display
can be turned off from the pop-up
menu with [Bottom].
7.4

How to Select the Range

The range can be selected automatically or manually. To set the range selection meth-
od, open the Layers menu, then set [Auto Range] to [ON] (automatic) or [OFF] (man-
ual) as appropriate.
Automatic range selection: The range is automatically changed to display the bot-
tom echo. The slider bar for range adjustment is turned off on modes other than bot-
tom lock* and bottom zoom*.
* The range for the bottom lock and bottom zoom displays can be adjusted with the
slider bar.
Manual range selection: Pinch the screen to change the range. Additionally, you can
adjust the range with the slider bar at the right side of the screen. Drag the slider knob,
or tap the [+] or [-] symbol at the top, bottom of the bar. The slider bar can be disabled
with [Show Range Slider] in the [Fish Finder] menu.
How to shift the display range
You can shift the display range up or down to see deep or shallow place. This function
is disabled during auto range operation.To shift the display range, drag the screen up
or down.
7.5

How to Adjust the Gain

Gain can be adjusted automatically (two methods, fishing, cruising) or manually.
7.5.1

Automatic gain adjustment

The automatic gain adjustment feature is convenient when you don't have the time to
adjust the gain because you are busy with other tasks. With the automatic gain mode
activated, gain, clutter, and TVG are automatically adjusted. The main functions of the
automatic mode are as shown below.
• The gain is automatically adjusted to show the bottom echo in reddish-brown color.
• The clutter function removes weak echoes such as noise and plankton.
• TVG is automatically adjusted.
• The gain between low- and high-frequencies is automatically adjusted.
7. FISH FINDER (SOUNDER)
The percentage of
main bottom type
is also displayed in
the graph.
7-7