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3.4 Heading Alignment
You have mounted the scanner unit facing straight ahead in the direction of the
bow. Therefore, a small but conspicuous target dead ahead visually should ap-
pear on the heading line (zero degrees).
In practice, you will probably observe some small bearing error on the display
because of the difficulty in achieving accurate initial positioning of the scanner
unit. The following adjustment will compensate for this error.
Correct bearing
relative to heading
Target
a
Scanner mounted
error to port
(HDG SW advanced)
1. Turn on the power. Press [RADAR MENU] [0] [0] [0] [2] [2] to select HL ALIGN
on the INITIAL SETTING1 menu.
2. Select a target echo (by gyrocompass, for example) at a range between 0.125
and 0.25 nm, preferably near the heading line.
3. Operate the EBL control to bisect the target echo with the heading line. (The
value shown on the display is scanner position in relation to ship's bow.)
4. Press [ENTER] to finish.
a
000
350
010
340
020
330
030
320
040
310
050
300
060
290
070
280
080
090
Apparent
270
260
100
position
250
110
240
120
of target
230
130
220
140
210
150
200
160
190
180
170
Picture appears
deviated clockwise.
Figure 3-2 Heading alignment
3-2
Apparent position
of target
Target
b
320
310
300
290
280
270
260
250
240
230
220
Scanner mounted
Picture appears
error to starboard
deviated counterclockwise.
(HDG SW delayed)
b
000
350
010
340
020
330
030
040
050
060
070
080
090
Correct
100
bearing
110
120
relative to
130
140
heading
210
150
200
160
190
180
170
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