Furuno FR-1500 MARK-3 Series User Manual page 29

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 position, press the [EBL OFFSET] key again.
CURSOR
330
320
310
A
300
290
A'
280
270
260
250
240
230
EBL 1
220
210
EBL
150.3°R
(a) Evaluating the target ship course in RM
VRM 1
000 010
350
020
340
030
040
050
060
120
130
140
150
200
160
VRM
190 170
180
3.85 NM
CURSOR
070 290
080 280
090 270
260
100
250
110
EBL 1
EBL
100.3°R
(b) Target ship on collision course
-1.15-
000 010
350
020
340
330
320
310
A
300
A'
240
230
220
210
200
160
190 170
180
VRM 1
030
040
050
060
070
080
090
100
110
120
130
140
150
VRM
3.85 NM