Humminbird 737 GPS Operation Manual page 17

under and adjacent to your boat, including the following items:
be positioned in the Sonar View to
depthbelow the cursor.
on the display and the depth of the
optional-purchase device is connected to the 700 Series™ Fishing System. If both devices are
83 kHz, Wide Beam Hollow Fish Symbol
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+
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.
200 kHz, Narrow Beam Shaded Fish Symbol
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.
Soft Bottom
RTS® (Real Time Sonar) Window
Battery Voltage - the voltage of the boat's
battery; can be set to alarm if the voltage falls
below a certain point.
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