Filter
Top Products
Instruction manual
83
857-164342 / Rev.C
Range other - Two horizontal lines indicate the range presented
in the lower echo frame.
Purse Seine - The depth of the purse seine sensor is indicated.
Vertical Markers
Event - A vertical line is drawn when a new event is generated.
Minute - A short vertical line is drawn in the upper part of the
echogram once every minute.
New Range - A vertical line is drawn when the range is
changed. The old range is written on the screen as an
annotation.
Gain
No - No TVG is applied. The echogram displays the input
power level at the transducer terminals. This echogram type is
used for special purposes when TVG is not applicable or
required..
School - The echogram displays volume backscattering strength
above the detected bottom, and surface backscattering strength
below the detected bottom. Volume backscattering strength is
suitable when observing a school of fish, and surface
backscattering strength is suitable when studying the properties
of the bottom.
Fish - The echogram displays target strength above the detected
bottom and surface backscattering strength below the detected
bottom. Target strength is suitable when observing individual
fish, and surface backscattering strength is suitable when
studying the properties of the bottom.
RCG (Reverberation Controlled Gain)
Apply this filter to enhance the detection of single fish on a
background of reverberation or noise.
Ping Filter
The ping-to-ping filter ”cleans up” the echogram by removing
random noise spikes with no correlation with the previous ping.
The function will thus make echoes appear more stable.
The ping filtering effect may be varied using the three different
settings provided, or it may be switched off.
Weak - Only two pings are correlated
Medium - Four pings are correlated
Strong - Eight pings are correlated.