Onwa Marine Electronics KR-12X8 - Manual (Page 28)

Tips for measuring bearing
Bearing measurements of smaller targets are more accurate; the center of
Bearings of stationary or slower moving targets are more accurate than
To minimize bearing errors keep echoes in the outer half of the picture by
changing the range scale; angular difference becomes difficult to resolve as
larger target pips is not as easily identified.
Bearings of faster moving targets.
a target approaches the center of the display.
2.18 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
on the menu and press the [ACQ/ENTER] key.
4.
EBL OFFSET
Press [ ] or [ ] key select "ON" and press [ACQ/ENTER] key.
5. Press the [EBL/VRM CONTROL] key.
6. Operate EBL1 so it passes through the center of the target.
If the target tracks along the EBL towards the center of the display (you vessel 's
Position), the target may be on a collision course.
To cancel, select SHIFT
and press the [ACQ/ENTER] key. Press [ ] or [ ]
key select "OFF" and press [ACQ/ENTER] key.
EBL1 origin
(Initial position
of target)
Target moved
Here.
Offset EBL
(EBL1)
Figure 2-10 Predicting collision course by
using the offset EBL
VRM1
36
NM
6
LP
HU
000
030
060
090
120
150
330
300
270
240
210
30.0V
22 45.135 N
21.237 E
115
13NM 90
VRM1 VRM2
EBL1 EBL2 138 R 152 R
6.1NM 32NM
21
EBL2