Simrad CE33 ChartSounder, Manual

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CE33 Echosounder operation Chapter 7-5
7.4 VRM expansion
This feature will provide an expanded view of the area near the
Variable Range Marker which will give a better separation of echoes.
The actual size of the expansion window can be adjusted in the
Setup display for 50kHz/200kHz.
As an example, from active Echo 50kHz display:
MENU
Call up the menu bar, and...
5,4
activate VRM expansion
The zoom level can be selected in seven steps, ranging from 1 to 50
meters, or converting to feet or fathoms (refer to Setup for units, sec-
tion 9.1). The VRM horizontal line can be moved up/down by means
of the cursor.
+/- Adjust range with the + and - keys
ENT Open Setup display - if any changes are required (see section 7.9)
ENT Confirm changes