CA42/50/52 Glossary of terms Appendix A
157
and deep water.
The setting “Special (40 log R) will adjust the TVG to show the same echo
strength for a given size fish at varying depths.The OFF position is used for net
sounders. In OFF position the TVG is inactive which means that the sounder
operates with a fixed gain between each transmitter pulse. Auto range is switched
to manual.
White line – is a control which places a white/black line at the displayed sea
floor and blanks out 4 pixels just below the line. The purpose of this is to help the
user detect targets, such as fish, which are very close to the sea floor and whose
echoes tend to merge with those of the sea floor itself.
VRM – Variable Range Marker – this refers to a horizontal black line shown on
the display screen. The user can measure the range to targets shown on the
display screen by use of the VRM. The depth to the VRM can be seen in the left
side of the screen. This function is not available if VRM expansion is ON.
Radar section:
Cursor EBL - can provide an image on the radar display which will determine
the risk of a collision if you continue on the proposed course line. The bearing
and distance from ship’s position to cursor position will be displayed in the top
line of the screen.
Cursor feature – The cursor appears on the display as a large (+) character.
To activate the cursor, just press the cursor key. The cursor may now be
positioned by using the cursor key. When the cursor is set to a position on the
screen, the bearing and distance from ship’s position to cursor position will be
displayed in the top line of the screen.
) To turn off the cursor, press CLR.
The chart cursor can be synchronized to the radar cursor, and thus be controlled
by the radar cursor in split screen operation.
EBL (Bearing mode) key – the EBL bearings may be displayed in either
degrees Relative “R” or True “T”, depending on the selected orientation (HU,
NU, TM).
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