Furuno FR-8251 Collision Assessment by Measuring Range Offset EBL, Canceling the cursor offset

1.16 Collision Assessment by	1.17 Measuring Range and
the Offset EBL	Bearing Between Two Targets

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

Target

(initial position)

70.0°R

EBL

No.1

EBL bearing

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.)

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.

No.1 EBL

B

A No.1 VRM

70.0°R	4.5NM
EBL	VRM
No.1 EBL	No.1 VRM

bearingrange

Figure 1-15 Measuring range and

bearing between two targets

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