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Simrad EY 500
In the Echogram Menu it is possible to set the lower limit of the colour scale
relative to target strength or volume backscattering strength (the commands TS
colour min. and Sv colour min.).
If, for example, this limit is set to -70 dB, the weakest colour includes the target
strength range -70 to -67 dB, while the strongest colour covers the range -37 to
-34 dB and stronger (-70 dB + 36 dB = -34 dB). The colour scale is displayed in
the upper part of the screen.
1.2.3 Display echogram
The echogram movement across the screen is determined by the setting of the
echogram speed parameter (Display Menu) and the current ping interval
(Operation Menu). The echogram colour presentation is mainly influenced by
TS and Sv colour minimum and the selected TVG type (DISPLAY/Echogram
Menu). If the bottom range is enabled, 20% of the main echogram is overwritten
by this bottom-referenced echogram. The echogram may include several lines
which are enabled by the corresponding parameters in the menu system.
In figure 2 arrows and numbers from (1) to (7) point out the different topics
explained below:
(1)
Layer lines.
Layer
lines
appear
when
the
LAYER
LINES
parameter
in
the
DISPLAY/Echogram Menu is set to ON. All layer lines for the active layers will
be in black colour except for the layer selected as the super layer.
The layer lines have higher priority than echo colour and will overwrite it. The
layer type and limits for each layer will determine the layout of the layer
picture. The surface layers will only have the lines above bottom visible in the
echogram. The bottom layer lines will be written relative to estimated bottom
depth. If the bottom detector fails to find the bottom depth, all the layer lines
described above will be absent. However, if the layer type is set to PELAGIC,
the layer lines are always written. In this case the bottom depth is not
necessary for successful integration and TS-detection.
(2)
Super layer.
One of the layers may be selected as a super layer. The layer selected as super
layer will have the layer lines written in red colour instead of black.
7
P3402/C
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