Heading Alignment - Furuno FAR-2117 Installation Manual

3.3

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