Variable Range Marker - Simrad CX34 Manual

Chapter 5-4
Press cursor left/right to adjust gain
Direct access to Setup display related to active echo display 50kHz
ADJ
or 200kHz - (see section 5.7)
Use the cursor to go to the function you wish to change the value for
Toggle between available values
+/-
Confirm changes, or...
ENT
MENU
Abandon changes and exit Setup display

5.4 Variable range marker

The VRM (Variable Range Marker) 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 top left side of the screen for a few
seconds after the VRM line is moved.
From active echo display:
Activate the Variable Range Marker function, and...
Move the VRM up/down
Adjust the range by means of the +/- keys
+/-
Turn VRM off again
CLR
CX34/44/54 Operator manual
Echo menu