Chapter 5
CVS-841/851
Basic Operation
5.3.5 Setting the partial zoom position in NORM/ZOOM mode
(1) Select ZOOM in NORM/ZOOM mode. To do so proceed as follows:
Menu -> Display -> Zoom Type -> ZOOM
(2) Select Zoom Range. To do so proceed; Menu -> Display -> Zoom Range and then select the
zoom range out of the following depth selections.
Depth Unit: meter/hiro/fathom/Italian fathom.
Range selections: 2.5, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80
Depth Unit: feet
Range selections:10, 15, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160, 180, 200, 220, 240, 260,
280, 320, 360, 400, 450, 500, 550, 600, 650
(3) To display Hi Frequency NORM/ZOOM image select H ZOOM, to display the Lo Frequency
NORM/ZOOM image select L ZOOM.
(4) Press the VRM key. The digital VRM display in green will be highlighted.
NOTE:
In case the digital display is shown in yellow, press the VRM key to change the display green.
(5) Press either the up or down arrow key to set an upper limit depth.
Figure 5.14 Layout of NORM/ZOOM mode display
The picture on the right
shows the display set up in
this procedure, Normal Low
Frequency range on the
right and Zoomed range on
the left with zoom starting
depth at 50 and zooming
range set to 20.
Zoom starting depth marker
A zoom starting depth is shown here in
green
Zoom range
0
5 0
1 0 0
1 5 0
2 0 0
5 0
5 5
6 0
6 5
7 0
A
5 0
Low
2001/05/23(Wed)
Image Speed 1/1
1 4 : 2 2 : 5 6
Shift
0 0
0
0
ZM
Zoom range marker
Zoomed range
VRM
5.4 Operating the VRM
The VRM (Variable Range Marker) is a moveable depth marker shown as a line across the display,
which is used to measure the depth of objects in high accuracy. The VRM may be shown in green or
yellow, i.e. green VRM for setting the zoom starting depth and yellow for normal VRM.
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