Heading Alignment - Furuno FR-2115/2125 Installation Manual

3. Adjust R21 on the INT Board so the value of TP6 is 4 Vpp. (For remote dis-
play, adjust R134 on the INT Board.)

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. 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.
Figure 3-1 Display pedestal
a
000 010
350
340 020
330 030
320
040
310 050
300 060
290 070
280 080
270 090 Apparent
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
TP1 TP6
R21
INT Board
(03P9252)
Apparent position
of target
Target
b
330
320
310
300
290
280
270
260
250
240
230
220
210
Scanner mounted Picture appears
error to starboard deviated counterclockwise.
(HDG SW delayed)
b
000 010
350
340 020
030
040
050
060
070
080
090
Correct
100
bearing
110
120
relative to
130
140
heading
150
200 160
190
180 170