Humminbird Matrix 20 - Manual (Page 9)

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under and adjacent to your boat, including the following items:
device is connected to the Matrix Fishing System. If both devices are connected, then only the
on the display and the depth of the bottom
Battery Voltage - the voltage of the boat’s
battery; can be set to alarm if the voltage
falls below a certain point.
RTS™ (Real Time Sonar) Window
Soft Bottom
Thermoclines - layers of water with different
temperatures that appear at different depths
and different times of the year. A thermocline
typically appears as a continuous band of
many gray levels moving across the display at
the same depth.
Structure - where fish may be hiding.
Fish - fish are displayed as arches and/or
fish icons, and the unit can be set to alarm
when a fish of a certain size is detected.
When a target is detected and Fish ID+ is on,
a Fish ID+
TM symbol with depth is displayed.
The size of the symbol shows the intensity of
the sonar return. The unit will clearly show
schools of Bait Fish as "clouds" of different
shapes and sizes, depending on the number
of fish and boat speed.
be positioned in the Sonar View to provide
below the cursor.
83 kHz, Wide Beam Hollow Fish Symbol
(DualBeam PLUS™ Units Only)
200 kHz, Narrow Beam Shaded Fish Symbol