Showing area your boat has just passed over, including:

A Surface clutter, created by turbulence around transducer.

B Individual fish.

C School of fish hovering above
the reef.

D Reef area, showing rocks above and harder bottom below.

E Digital readout of depth, water temp and boat speed.

F Speed of picture advance
(also called "scrolling" rate).

G Sounder depth scale.

H A-Scope Picture, showing immediate, real-time returns of echoes including:

I School of fish below the boat, just above the bottom.

J Softer bottom below boat.