Furuno FAR-21 7-BB Series, Operator'S Manual

Page: 64 / 305

1. RADAR OPERATION
1-38
1.23 Measuring Range and Bearing Between Two
Targets
By keyboard
1. Press the [EBL OFFSET] key. Operate the trackball to place the origin of the
No. 1 EBL, for example, on a target of interest (target 1 in the illustrated
example).
2. Operate the EBL rotary control until the EBL passes through another target of
interest (target 2).
3. Operate the VRM rotary control until the range marker on the EBL is on the
inside edge of target 2. The active VRM readout at the lower-right corner of
the screen indicates the distance between the two targets.
4. You can repeat the same procedure on third and fourth targets (targets 3 and
4) by using the No. 2 EBL and the No. 2 VRM.
Bearing is shown relative to own ship with suffix “R” or as a true bearing with
suffix “T” depending on EBL relative/true settings of EBL CURSOR BEARING in
the MARK menu. To return the EBL origin to the screen center, press the [EBL
OFFSET] key again.
By trackball
1. Display an EBL, following steps 1-3 in “By trackball” in paragraph 1.21.1.
2. With the cursor inside the effective display area, push the left button, roll the
wheel to show “EBL OFFSET / EXIT” in the guidance box and then push the
left button.
3. Roll the trackball to place the cursor on target 1 and then push the wheel.
4. Operate the No. 1 VRM until the range marker on the EBL aligns with target 2.
The active VRM readout at the lower-right corner of the screen indicates the
distance between the two targets.
5. You can repeat the same procedure on third and fourth targets (targets 3 and
4) by using the No. 2 EBL and the No. 2 VRM.
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EBL
origin
R2
Target 2
No.1
EBL
No. 2
EBL
Range
Marker
Range/bearing
between targets
1 and 2
Range/bearing
between targets 3 and 4
EBL1
EBL2
>140.0
°
R<
335.2
°
R
VRM1
VRM2
>0.50NM<
0.98NM
Range
Marker
Target 4
Target 3
Target 1
Measuring range and bearing between two targets
To return the EBL origin to the screen center, show “EBL OFFSET / EXIT” in the
guidance window and then push the left button.