3.4 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 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 antenna 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

 

 

Antenna mounted

Picture appears

Antenna mounted

error to port

deviated clockwise.

error to starboard

(HDG SW advanced)

 

(HDG SW delayed)

Figure 3-2 Heading alignment

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.

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 antenna position in relation to ship's bow.)

4.Press the [ENTER] key to finish.

3-2

Page 36
Image 36
Furuno FR-2125V installation manual Heading Alignment, Picture appears Deviated counterclockwise