Furuno 1823C manual Using the Offset EBL, Predicting collision course

2. RADAR OPERATION

2.17Using the Offset EBL

The offset EBL can be used to predict a potential collision course. It can also be used to measure the range and bearing between two targets.

2.17.1Predicting collision course

The procedure below may be used to check if a radar target is on a potential collision course with your vessel.

1.Press the [EBL/VRM] key to show the EBL/VRM soft keys.

2.Press the EBL1 ON soft key to turn on the EBL1.

3.Press the OFFSET soft key. The origin of EBL1 moves to the cursor position, which is marked with an “X.”

4.Use the trackball to place the cursor on the radar target which looks like it might be on a collision course with own ship.

5.Push the [ENTER] knob to fix the origin position.

6.After waiting for a few minutes (at least three minutes), rotate the [ENTER] knob so the EBL bisects the target at the new position. If the target tracks along the EBL towards the center of the display (your ship’s position), the target may be on a collision course with your vessel.

7.To cancel the offset EBL, press the OFFSET soft key.

Target tracked here

Initial target position

3nm

12/LP

H-UP

EBL1

45.0˚R

VRM1

-.---nm

319.9° M EBL

VRM

EBL1

ON

VRM1

ON

OFFSET

EBL2

ON

VRM2

ON

+ 359.9 ˚R 11.70nm

Predicting collision course with the offset EBL

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