Raymarine C140w User Reference Handbook page 122

Measuring using Electronic Bearing Lines (EBLs)
An Electronic Bearing Line (EBL) is a line drawn from your boat to
the edge of the window. When this line is rotated to align with a
target, its bearing relative to your boat's heading is measured and
displayed on the ADJUST EBL softkey. The data is also displayed if
you select the EBL with the cursor.
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Note: The default bearing mode for EBLs is relative to your
vessel's heading. If heading data is available, you can set the
bearing mode to be relative (REL), magnetic/true (M/T). When
M/T is selected, the EBL bearings will be expressed as either
true or magnetic, dependant on the equipment connected. The
current EBL bearing is shown on both the radar screen EBL label
and on the ADJUST EBL softkey.
Measuring using combined VRM and EBL
A VRM and an EBL can be combined to measure both the range
and the bearing of the specified target.
C-Series Widescreen user reference