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3.3 Automatic Video Sounder Operation
The video sounder can be operated either automatically or manu-
ally. Automatic operation is useful when you are preoccupied with
other tasks and do not have the time to adjust the display.
How it works
The automatic function automatically selects the proper gain and
range scale according to depth. It works as follows:
• Range changes automatically to locate the bottom on the lower
half of the screen. It jumps to one step shallower range when
bottom echoes reach a half way point of the full scale from the
top and to one step deeper range when they come to the lower
edge of the scale.
• The gain is automatically adjusted to display the bottom echo in
reddish brown.
• Clutter level (on the VIDEO SOUNDER SETUP menu) is au-
tomatically adjusted.
Two types of automatic modes
Two types of automatic modes are available: cruise and fish. Cruise
is for tracking the seabed, and fish is for searching fish schools.
Since "Cruise" uses a higher clutter rejection setting than "Fish," it
is not recommended for fish detection – weak fish echoes may be
deleted by clutter rejection.
How to enable automatic video sounder operation
1) Press the [AUTO] key to select automatic mode desired.
AUTO MODE
▲ Cruise
Fish
▼ Manual
Figure 3-9 AUTO display