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3-2
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.
000
010
020
030
040
050
060
070
080
090
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
a
Target
a
Correct bearing
relative to heading
Scanner mounted
error to port
(HDG SW advanced)
Picture appears
deviated clockwise.
Apparent
position
of target
000
010
020
030
040
050
060
070
080
090
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
340
350
b
Target
b
Apparent position
of target
Scanner mounted
error to starboard
(HDG SW delayed)
Picture appears
deviated counterclockwise.
Correct
bearing
relative to
heading
Figure 3-2 Heading alignment
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.