In viewing the liquid crystal display for the illustrated depth sounder data display unit, what should be done if the graphic display of the ocean bottom is no longer visible on the screen? Illustration EL-0186

Illustration EL-0186: the U.S. Coast Guard has not released this illustration.

Question

In viewing the liquid crystal display for the illustrated depth sounder data display unit, what should be done if the graphic display of the ocean bottom is no longer visible on the screen? Illustration EL-0186

Illustration EL-0186: the U.S. Coast Guard has not released this illustration.

Accepted Answer

Option A: Increase the range adjustment.. Loss of the ocean bottom graphic on an echo sounder typically occurs when the actual water depth exceeds the currently selected depth range scale. Increasing the range adjustment expands the timing window of the receiver, allowing the processor to capture deeper acoustic return signals.