Raymarine Combined Pathfinder Radar, RL80CRC PLUS manual Measuring Range and Bearing Using VRM/EBLs

Chapter 3: Standard Radar Operations 3-13

3.4 Measuring Range and Bearing Using VRM/EBLs

The Pathfinder Plus Radar display allows you to specify up to two Electronic Bearing Lines (EBLs), each with an associated Variable Range Marker (VRM), using the VRM/EBL key.

A standard VRM is displayed as a circle with its centre on your vessel’s position, and it’s EBL is displayed as a line from the origin to the edge of the radar picture display. However, each pair can be floated, so that the origin can be moved.

3nm	RR	126°T H-UP		AUTO
	OFF			T	IR
					Floated VRM2
					(long-dashed line)
					Floated EBL2
					(long-dashed line)
		VRM
					VRM1 (short-dashed line)
					EBL1 (short-dashed line)
VRM/EBL 2
BRG 015° T					VRM/EBL data boxes
RNG	096nm
CURSOR		CURSOR	VRM/EBL 1
BRG 146° T		50°47^72N	BRG 243° T
RNG 1.70 nm		001°10^58N	RNG 0.98 nm

Two cursor readout boxes

D3974-1

Figure 3-11: EBL and VRM Displays

Note: When using VRM/EBLs, you may wish to turn off the range rings to make the VRMs clearer (see Section 2.4).

VRMs move if you change the range scale, so that the actual range you have marked is maintained. VRM/EBLs also move if you offset the centre.

When a VRM/EBL pair is active, its bearing and range are displayed in its associated data box, which can be moved, deleted or reinstated.

The bearing information is displayed as either the bearing relative to your vessel’s heading or (if heading data is available from a position fixer or compass) the actual bearing in degrees magnetic or degrees true. These are controlled by the setup parameters (see Section 7.4).

The VRM/EBL functions allow you to perform the following tasks:

• Measure the range of a target or point from your vessel’s position, using a

VRM

EBLs

Bearing Using VRM/

MeasuringRange and