Furuno FR-2125V - Manual (Page 32)

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1.19 Collision Assessment by Offset EBL
The origin of the EBL can be placed anywhere with the trackball to enable measurement
of range and bearing between any two targets. This function is also useful for assessment
of the potential risk of collision. To assess possibility of collision:
1. Press the [EBL ON] key to display or activate an EBL (No. 1 or 2).
2. Place the cursor (+) on a target appearing as threatening (A in the illustrated example)
by operating the trackball.
3. Press the [EBL OFFSET] key on the mode panel, and the origin of the active EBL shifts
to the cursor position. Press the [EBL OFFSET] key again to anchor the EBL origin.
4. After waiting for a few minutes (at least 3 minutes), operate the EBL control until the
EBL bisects the target at the new position (A 1 ). The EBL readout shows the target
ship’s course, which may be true or relative depending on the settings on the RADAR
1 menu.
If relative motion is selected, it is also possible to read CPA (Closest Point of Approach)
by using a VRM as shown below (Figure (a)). If the EBL passes through the sweep
origin (own ship) as illustrated (Figure (b)), the target ship is on a collision course.
5. To return the EBL origin to the own ship’s position, press the [EBL OFFSET] key again.
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(a) Evaluating course of target ship in RM (b) Target ship on collision course
Figure 1-22 Collision assessment with the offset EBL