Humminbird 4089701 the area under your boat, including the following items:

the area under your boat, including the following items:

Bait Ball

Hollow Fish Symbol (see Fish ID+™)

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 gray levels moving across the display at the same depth.

Structure - Where fish may be hiding.

Fish - The Fishfinder 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.

Shaded Fish Symbol (see Fish ID+™)

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.

to the 500 Series™ Fishfinder.

8 What’s on the Sonar Display