Furuno FR-2805 Series - Manual (Page 32)

1-17
not the corresponding VRM is displayed.
The range marker changes its position
along the EBL with the rotation of the VRM
control.
Press the EBL OFF key to erase each
EBL.
000 010
020
030
040
050
060
070
080
090
100
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170 180 190
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350 No.2
EBL Target
blip
No.1
EBL
VRM
>0.978NM<
1.118NM EBL
> 32.5°T<
298.0°T
Active EBL is indicated
with this marker.
Range scale
markers on EBLs
1.18 Collision Assessment by
Offset EBL
The origin of the EBL can be placed any-
where with the trackball to enable mea-
surement of range and bearing between
any 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 ac-
tivate an EBL (No.1 or 2).
2. Place the cursor (+) on a target of in-
terest (A in the illustrated example) by
operating the trackball.
3. Press the EBL OFFSET key on the
mode panel, and the origin of the ac-
tive 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'). The EBL readout
shows the target ship's course, which
may be true or relative depending on
the settings on the RADAR 2 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 target ship's course and
CPA in relative motion mode
(b) Target ship on collision course
No.1
VRM
A
A 1
Cursor
No.1
EBL
VRM
> 3.85NM< EBL
> 140.0°R<
VRM
> 0.00NM< EBL
> 118.2°R<
A
A 1
Cursor
No.1
EBL