Furuno FR-8111 - Manual (Page 30)

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1.16 Collision Assessment by
the Offset EBL
The origin of the No.1 EBL can be placed any-
where with the trackball to assess the risk of col-
lision, as well as to measure the range and bearing
between two targets.
1) Press the EBL ON key to turn on (or activate)
the No.1 EBL.
2) Press the CURSOR OFFSET key.
3) Operate the trackball to place the No.1 EBL
origin on the target.
4) Operate the EBL control to pass the No.1 EBL
through the screen center.
You can anchor the EBL, to continue monitoring
target’s track, by pressing the CURSOR OFFSET
key again. If the target tracks along the No.1 EBL
toward the screen center, the possibility of colli-
sion exists.
No.1 EBL
70.0°R
EBL
No.1
EBL bearing
Target
(initial position)
Figure 1-14 How to assess risk of collision
Canceling the cursor offset
Press the CURSOR OFFSET key to return the
No.1 EBL origin to the screen center. (Each press-
ing of the key links the offset EBL with the cur-
sor, anchors the offset EBL, or returns No.1 EBL
origin to the screen center.)
1.17 Measuring Range and
Bearing Between Two Targets
The range and bearing between two targets, for
example, targets A and B in Figure 1-15, can be
measured by using the CURSOR OFFSET key.
1) Press the EBL ON key to turn on (or activate)
the No.1 EBL.
2) Press the CURSOR OFFSET key.
3) Operate the trackball to place the No.1 EBL
origin on target A.
4) Operate the EBL control to pass the No.1 EBL
through target B.
5) Press the VRM ON key to turn on (or acti-
vate) the No.1 VRM.
6) Operate the VRM control to place the No.1
VRM on the inside edge of target B.
Range and bearing between the two targets ap-
pear in the cursor data window at the bottom of
the display.
A
B
No.1 EBL
No.1 VRM
70.0°R
EBL VRM
No.1 EBL No.1 VRM
bearing range
4.5NM
Figure 1-15 Measuring range and
bearing between two targets