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