Off-Centring, Carrying And Dropping An Erbl - Sperry Marine Visionmaster FT ECDIS User Manual

Electronic Range and Bearing Lines
To change the ERBL range from the Control Panel:
Turn the VRM rotary control clockwise to increase the range, or anti-
clockwise to decrease. Turning the VRM control changes the ERBL into a
VRM/EBL (i.e. the VRM circle is drawn on the display).
If both VRMs are switched off, turning the VRM rotary control will
automatically switch on VRM1. If VRM1 is switched off but VRM2 is
on then turning the rotary control will adjust the VRM2 range.
To change both the ERBL range and bearing:
1. Move the cursor to the intersection position of the ERBL and it
changes to a bidirectional arrow indicator.
2. Hold down left key and move trackball left or right to change the
ERBL range and bearing. Bearing and range readout values
automatically change as the ERBL is moved on the screen.
3. Release the left key to fix the ERBL range and bearing location.

Off-Centring, Carrying and Dropping an ERBL

Default position for ERBLs 1 & 2 is centred on own ship's CCRP. When
centred, the ERBL can be offset, dropped, or its end point dropped. An
ERBL is always carried unless it is "dropped" or "offset & carried".
Initial options available by right clicking on the EBL/VRM buttons are:

Offset Origin - moves ERBL to a location anywhere on the display.
The ERBL is then in Carried mode (C).

Drop Origin (D) - drops ERBL in a fixed ground reference location
on the display regardless of stabilisation mode (ground or water
referenced). As course and speed changes, the ERBL remains
stationary at this fixed point.

Drop End Point (E) - drops the EBL and VRM intersection (the
ERBL end point) at a fixed, ground referenced location, but carries
the origin with own ship. The range and bearing to the end point
update every second. Drop End Point is only allowed when the
ERBL origin is centred.
After Offset Origin or Drop Origin has been applied the following option
becomes available:

Centre Origin - moves the ERBL back to the position centred on
own ship's CCRP.
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ECDIS User Guide
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