Humminbird 700 Series Operating Manual page 23

the area under and adjacent to your boat, including the following items:
is connected to the 700 Series™ Fishing System. If both devices are connected, then only the
High Sonar Intensity Return
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 colors moving across the display at the
same depth.
Bait Ball
Fish - The Fishing System displays fish as arches
and/or fish icons, and can be set to alarm when
a fish of a certain size is detected. When a
target is detected, a Fish ID+™ symbol appears
on the display with the depth displayed above
it. The size of the symbol indicates 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.
Structure - Where fish may be hiding.
Cursor - Available in Freeze Frame and can
be positioned in the Sonar View to provide
depth of a sonar return and bottom depth below
the cursor.
RTS (Real Time Sonar) Window™
Low Sonar Intensity Return
11 What's on the Sonar Display