Users Manual Part 6

3. ADJUSTMENTS
3-4
3.2 How to Align the Heading
You have mounted the Antenna Unit facing straight ahead in the direction of the bow.
Therefore, a small but conspicuous target dead ahead visually must 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 follow-
ing adjustment will compensate for this error.
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.
3. Read the target bearing.
4. Measure the bearing of the stationary target on a navigation chart and calculate
the difference between the actual bearing and apparent bearing on the radar
screen.
5. Show the [RADAR INSTALLATION] menu.
6. Select [ECHO ADJUSTMENT] followed by [HD ALIGN].
7. Key in the bearing difference. The setting range is 0° to 359.9° (default: 000.0°).
8. Confirm that the target echo is displayed at the correct bearing on the screen.
3.3 How to Adjust the Sweep Timing
Sweep timing differs with respect to the length of the signal cable between the Anten-
na Unit and the Processor Unit. Adjust sweep timing at installation to prevent the fol-
lowing symptoms:
• The echo of a "straight" target (for example, pier), on the 0.25 NM range, appears
on the display as being pulled inward or pushed outward. See the figure below.
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
Correct bearing
(relative to heading)
Antenna mounted error
to port
(HDG SW advanced)
Picture appears
deviated clockwise.
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
Apparent position
of target
Correct bearing
(relative to
heading)
Correct bearing
(relative to
heading)
Correct bearing
(relative to
heading)
Apparent
position of
target
Apparent
position of
target
Apparent
position of
target
Antenna mounted error
to starboard
(HDG SW delayed)
Picture appears
deviated counterclockwise.
Front of antenna
Front of antenna
a
b
(1) Correct (2) Target pushed
inward
(3) Target pushed
outward