Simrad ER60, Operator'S Manual

Page: 60 / 182

Simrad ER60 Operator manual
52
850-164692 / Rev.B
Bottom Detection
The Bottom Detection dialogue is accessed from the Depth
view shortcut menu.
Purpose
This dialogue is used to set
the parameters for the
bottom detection algorithm.
Note that only one set of
bottom detector parameters
are valid for a frequency
channel. This means that
changes made in this
dialogue will have effect on
the bottom detector settings
for all depth views for the
same frequency channel!
Parameters
Minimum Depth - The
bottom detector starts the
search for the bottom echo at
this depth. The detector will
fail in shallow water if you
select a too large depth
value, and the tail of the
transmitting pulse or a large
school of fish may cause
problems if a too small value
is set.
Maximum Depth - The search for the bottom echo extends
down to this depth whenever bottom track is lost. Enter a
slightly larger depth value than the deepest spot you expect to
visit in order to avoid annoyingly long ping intervals every time
bottom track is lost. A depth value of 0 disables the bottom
detector.
Backstep Min. Level - After the estimated depth of the bottom
detector, the detected depth is automatically adjusted by
stepping back according to the value of the setting you have
chosen. This allows the echo sounder to verify that the correct
bottom depth has been located. If the value you enter is too
large (close to 0 dB) the adjustments will be very small. The
default value is -50 dB.