Furuno FR-1500 - Manual (Page 29)

-1.15-
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.
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A'
A
EBL 1
VRM
3.85 NM
EBL
150.3°R
VRM 1 CURSOR 000
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A'
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EBL 1
VRM
3.85 NM
EBL
100.3°R
VRM 1 CURSOR
(a) Evaluating the target ship course in RM (b) Target ship on collision course