Sperry Marine VISIONMASTER FT ECDIS-E, User Manual

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ECDIS-E User Guide Electronic Range and Bearing Lines
65934012 10-5
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 referenced
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.
After Drop origin only has been applied the following option becomes
available:
•
Carry Origin (C) - the ERBL origin moves relative to own ship
from the location selected in Drop Origin.
•
Carried Mode (Offset Origin or Carry Origin) – if the EBL is set to
True Bearing (T) when in Carried Mode (C) the ERBL will maintain
its true bearing origin offset. If the EBL is set to Relative Bearing
(R) the bearing offset origin will move relative to own ship’s
heading.
Switching the EBL bearing between relative (R) and true (T) in carried
mode will also change the offset origin bearing between REL and
TRUE.
To change the origin of an ERBL do the following:
An ERBL centred on own ship’s CCRP may be
offset by right clicking on the EBL button and
selecting Offset Origin from the popup list.