Simrad SD570, Operator'S Manual

Page: 36 / 128

Simrad SD570
6 850--160138 / A
2.5 180
°
/Audio
In this mode the upper half of the screen shows a 180
°
bow up
presentation, while the lower part is used for a recording of the
audio channel.
Figure 4 - 180
°
/Audio
The audio channel is shown with a continuous white line in the
horizontal picture, and can be trained in any direction. The
recorded echoes are a direct replica of the echoes under the
white audio line.
As the audio channel is recorded over a period of time, this
mode is especially useful for detection of weak echoes mixed
with reverberation or noise.
The recording of the last 512 transmissions is always stored in
the computer, even if another mode is selected. That means
that this recording will always be presented when selecting the
180
°
/audio mode.
Note that the ping sector will remain 360
°
if OMNI is selected,
but that only 180
°
are presented.