Furuno NAVNET 1824C Operator's Manual page 192

Item
Fish Alarm Sets the fish alarm sensitivity; that is,
Level the minimum echo strength which will
trigger the fish alarms.
Transmission Turns TX power on/off.
TVG TVG (Time Varied Gain) compensates
(HF,LF) for propagation attenuation of the
ultrasonic waves. It does this by
equalizing echo presentation so that
fish schools of the same size appear in
the same density in both shallow and
deep waters. In addition, it reduces
surface noise. Note that if the TVG
level is set too high short range
echoes may not be displayed.
Echo Offset If the on-screen echo level appears to
(HF, LF) be too weak or too strong and the
level cannot be adjusted satisfactorily
with the gain control, adjust echo
offset to compensate for too weak or
too strong echoes.
Bottom Level If the depth indication is unstable in
(HF, LF) automatic operation or the bottom
echo cannot be displayed in
reddish-brown by adjusting the gain
control in manual operation, you may
adjust the bottom echo level detection
circuit, for both HF and LF, to stabilize
the indication. Note that if the level is
set too low weak echoes may be
missed and if set too high the depth
indication will not be displayed.
KP Pulse
Selects source of keying pulse.
Smoothing Smoothes echoes to present stable
display. The higher the setting the
greater the smoothing.
TLL Output Outputs current position to plotter
where it is marked with TLL mark. Use
soft key to output TLL.
Sounder system setup menu description
Description
7. CUSTOMIZING YOUR UNIT
Settings
High: Orange and stronger echoes
trigger the alarm.*
Medium: Yellow and stronger echoes
trigger the alarm.*
Low: Green and stronger echoes
trigger the alarm.*
* = 8-color display
On, Off
0-9
-50 - +50
-100 - +100
Internal, External (See installation
manual.)
SM1-SM4, OFF
ON, OFF
(Con't on next page)
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