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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2. When Offset is selected the VRM is immediately positioned
wherever the cursor is on the video circle. Using the trackball move
the VRM to the required offset location. When the VRM is offset the
centre of the VRM is indicated by a white dot.
3. Left click to position, the VRM is now in Carry mode and moves
relative to own ship. Or right click to cancel and return VRM to own
ship's CCRP.
Where Drop Origin (D) or Drop EBL / VRM is selected:
1. A white dot is displayed at the centre of the VRM and the VRM and
its associated caption are shown with the suffix (D) . Unlike Offset,
the VRM does not move when the cursor moves. When the cursor
is positioned over the VRM origin it changes to a bidirectional arrow
indicator.
2. To move, left click and hold on the VRM origin. With the left button
held down, use the trackball to move the VRM to the required
location and release the left button to drop the VRM. The VRM
remains stationary in the selected location.
To re-position the VRM back to own ship's CCRP
either right click on the VRM caption and select
Centre Origin from the drop down window, or
right click on the VRM origin and select Centre
EBL / VRM from the semi-transparent window.
Where Drop End Point (E) is selected from the VRM readout:
1. The EBL and VRM captions are shown with the suffix (E). As the
ship moves the ERBL range and bearing are continually updated to
the dropped intersection point.
In Drop End Point mode, the EBL/VRM readouts are greyed out.
The only way to change the EBL/VRM values or move the ERBL
intersection point is on the video circle.
2. To cancel Drop End Point right click on the
readout and select Carry End Point (C)
from the drop down.
3. Or to drop the ERBL at the current position
select Drop Origin (D) from the drop down
window, or right click on the VRM origin and select Drop EBL /
VRM.