Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Electronic Range and Bearing Lines Radar/Chart Radar User Guide
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Variable Range Marker (VRM)
Each VRM can be turned on or off independently. Previous settings are
remembered when they are switched off. The default range value for VRM
1 is 2.5 NM; the default range value for VRM 2 is 4.5 NM.
To turn on a VRM do the following:
1. Left click on the VRM caption button.
The VRM button is highlighted, the
lettering appears bold and the range
value is displayed. On the video circle,
the VRM is displayed as a dashed
circle centred on the CCRP. The size of the circle is dictated by the
VRM range readout.
2. To turn the VRM off left click on the VRM caption button. The VRM
is removed from the video circle, and the range value is replaced
by the
Off caption.
Changing the VRM and EBL range
There are a number of ways to change the VRM range. Either enter the
values in the VRM field or manually change the VRM diameter on the video
circle.
The VRM range can also be changed in conjunction with the EBL bearing.
To change the range of a VRM do the following:
To manually change the VRM range:
1. Position the screen cursor anywhere over the VRM circle line, the
screen cursor changes to the following graphic .
2. Left click on any point of the circle line and hold the left key down.
3. Move the trackball left or right to change the size of the circle. The
range readout automatically changes in the VRM field.
4. When the range is correctly set left click to accept.
To change the VRM range from the readout:
1. Left click in the readout field. The readout text becomes editable
(green).
2. Move the trackball left or right until the required readout is
displayed.
3. Left click to accept new readout and exit edit mode.