Collision Assessment By Offset Ebl - Furuno FR-2125V Operator's Manual

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
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.
330
320
310
A
300
290
280
A
270
260
250
240
230
No. 1 EBL
220
210
EBL
> 150.3 R<
(a) Evaluating course of target ship in RM
Figure 1-22 Collision assessment with the offset EBL
000
350 010
340 020
030
040
050
060
1
120
130
140
150
200
160
190
170
180
1
). The EBL readout shows the target
310
300
290
070
280
080
270
090
260
100
250
110
240
230
No.1 EBL
EBL
> 150.3 R<
(b) Target ship on collision course
000
350 010
340 020
330 030
320
A
1
A
220
210 150
200
160
190
170
180
040
050
060
070
080
090
100
110
120
130
140
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