3. SETTING AND ADJUSTMENT
3.3Heading Alignment
You have mounted the antenna unit facing straight ahead in the direction of the bow. Therefore, a small but conspicuous target dead ahead visually should appear 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 antenna unit. The following adjustment will compensate for this error.
Correct bearing | α |
relative to heading |
|
α
Target
Antenna mounted error to port (HDG SW advance)
340 | 350 | 000 | 010 | 020 |
|
330 |
|
|
| 030 |
|
320 |
|
|
| 040 |
|
310 |
|
|
| 050 |
|
300 |
|
|
| 060 |
|
290 |
|
|
| 070 |
|
280 |
|
|
| 080 |
|
270 |
|
|
| 090 | Apparent |
260 |
|
|
| 100 | |
250 |
|
|
| 110 | position |
|
|
|
|
| |
240 |
|
|
| 120 | of target |
|
|
|
| ||
230 |
|
|
| 130 | |
220 |
|
|
| 140 |
|
210 |
|
|
| 150 |
|
200 | 190 | 180 | 170 | 160 |
|
|
|
|
Picture appears deviated clockwise.
Apparent position | β |
of target |
|
β | Target | 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 |
|
|
| 130 | relative to |
|
| 230 |
|
|
| ||
|
|
|
|
|
| 120 | heading |
|
| 210 |
|
|
| 150 | |
|
| 220 |
|
|
| 140 |
|
|
| 200 | 190 | 180 | 170 | 160 |
|
|
|
|
|
|
Antenna mounted error | Picture appears |
to starboard (HDG | deviated counterclockwise. |
SW delayed) |
|
Heading alignment
1.Select a stationary target echo at a range between 0.125 and 0.25 nm, preferably near the heading line.
2.Operate the EBL control to bisect the target echo.
