How To Establish Vertical Markers; How To Select Tvg Gain In The Echogram Dialog - Simrad ES70 Operator's Manual

How to establish vertical markers

The echograms provided by the ES70 may contain additional information. The following
lines, markers and annotations can be enabled:
• Bottom line on page 54
• White line on page 54
• Hardness line on page 55
• Trawl line on page 55
• Variable depth line on page 56
• Range other lines on page 56
• Biomass line on page 57
• Range scales on page 57
• Vertical ticks on page 57
• Annotations on page 58
This procedure explains how you can enable one or more vertical markers in the current
echogram.
1 Click the
Active
→ Active menu on page 107
2 Click
Echogram
3 On the tab, observe the various vertical markers that can be enabled.
Lines
Note
The annotations are controlled on the
in the echogram, you must enable them in the
Enable the vertical markers you wish to see.
4
5 Click to save the current settings and close the dialog.
OK

How to select TVG gain in the Echogram dialog

TVG means Time Varied Gain.
The whole idea with TVG is that echoes from fish shall have the same echo level (colour)
independent of their depths.
The ES70 has a TVG range down to 15 000 meters, which for all practical purposes is
unlimited. The ES70 does not have a TVG compensated receiver like most other echo
sounders. In the ES70 the TVG is made in software after the echoes from the receiver(s)
have been converted to digital format. In order to make this work the receiver must
have very large dynamic range.
343539/B
icon under the menu to open the
Main
to open the
Echogram
Active
dialog.
dialog, but to place the annotations
Annotation
dialog.
Echogram
Operational procedures
menu.
85