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9
2.13 Measuring the Bearing
There are two ways to measure the bearing to a
target: by the cursor, and by the EBL (Electronic
Bearing Line).
By cursor
Operate the omnipad to bisect the target with
the cursor intersection. The bearing to the tar-
get appears at the bottom of the display.
By EBL
1. Press the [EBL/VRM SELECT] key to cir-
cumscribe an EBL readout (at the bottom
left-hand corner). Each press of the key se-
lects the readout of EBL1, EBL2, VRM1 or
VRM2 in that order.
2. Press the [EBL/VRM CONTROL] key to
enable control of the omnipad.
3. Operate the omnipad to bisect the target with
the EBL.
4. Check the EBL readout at the bottom left-
hand corner of the display to find the bear-
ing to the target.
5. To anchor the EBL, press the [EBL/VRM
CONTROL] key.
To erase the EBL and its readout, press and hold
down the [EBL/VRM CONTROL] key about
two seconds.
6.0 NM
2.0
EBL1 bearing
EBL1 bearing
40.0° R
135.0° R
EBL
EBL1
EBL2
Target
Cursor
Cursor
Bearing
40.0°R 4.0 NM
Figure 2-9 How to measure bearing by EBL
and cursor
Note: The bearing readout for the EBL and the
cursor can be displayed in relative or true
bearing (true bearing requires heading
sensor input). For north up and course
up display modes the bearing reference
is always true. For details see the next
chapter.
Tips for measuring bearing
¡ Bearing measurements of smaller targets are
more accurate; the center of larger target pips
is not as easily identified.
¡ Bearings of stationary or slower moving tar-
gets are more accurate than bearings of faster
moving targets.
¡ To minimize bearing errors keep echoes in
the outer half of the picture by changing the
range scale; angular difference becomes dif-
ficult to resolve as a target approaches the
center of the display.
2.14 Using the Offset EBL
The offset EBL provides two functions: predict
collision course of radar target and measure the
range and the bearing between two targets.
Predicting collision course
1. Press the omnipad to place the cursor on the
center of the target.
2. Press the [EBL/VRM SELECT] key to
choose EBL1 readout and then press the
[EBL/VRM CONTROL] key.
3. Select EBL OFFSET on the menu and press
the [ACQ/ENTER] key.
4. Press the [EBL/VRM CONTROL] key.
5. Operate EBL1 so it passes through the cen-
ter of the target.
If the target tracks along the EBL towards the
center of the display (your vessel’s position),
the target may be on a collision course.
To cancel, select EBL OFFSET and press the
[ACQ/ENTER] key.
20


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