Simrad EQ60 - Manual (Page 94)

Simrad EQ60
82
857-164342 / Rev.C
Surface - Auto Start - The echogram is related to the sea
surface. Vertical range is manually selected in the Surface
Range dialogue box. The EQ60 performs automatic adjustment
of the start depth keeping the bottom echo inside the visible
echogram.
Bottom - The echogram is related to the detected bottom. Stop
depth (lower echogram boundary) and vertical range are
manually selected in the Bottom Range dialogue box. The
echogram is only drawn for pings having a successful bottom
detection.
Trawl - Trawl sensor systems communicate headrope depth and
headrope-to-footrope distance to the EQ60 at regular intervals.
The echogram covers the vertical opening of the trawl including
a small margin at each side. The headrope and footrope margins
are identical. Their size is selected in the Trawl Range dialogue
box. The headrope-to-footrope distance can be manually set in
the Trawl Interface dialogue box for trawl sensor systems not
measuring the trawl opening, or when the measured
headrope-to-footrope distance is unreliable. The echogram is
only drawn when trawl position information is available.
Horizontal Depth Lines
Scale - Equidistant horizontal scale lines are drawn inside the
echogram in the current foreground colour; black during day
and white during night. A maximum of 50 scale lines can be
drawn. No scale lines are drawn when the scale line count is set
to zero.
Bottom:
• On - The detected bottom depth is shown as a thin line in the
echogram. The line is drawn in the current foreground
colour; black during day and white during night.
• Off - The bottom line is switched off.
• White Line - A band in the current background colour is
drawn below the detected bottom depth.
Variable Depth - When enabled a horizontal depth line is
placed wherever you click in the Echogram view. The depth of
the line is displayed at the left end of it. In the History diagram
the depth for each ping is displayed individually.
Trawl - Headrope and footrope depth are indicated by two red
lines in the echogram. Continuous lines are drawn when the
current depth values are available, and dotted lines are drawn
for a period of two minutes when this information is not
available. No lines are drawn after two minutes.