Furuno 851 MARK-2 - Manual (Page 28)

3. ADJUSTMENT
3-5
3.5 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 mark (zero degrees).
In practice, you will probably observe some small 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, 360 degrees.
1. Identify a suitable target (for example, ship or buoy) at a range between 1/8 to
1/4 miles, preferably near the heading mark. To minimize error, keep echoes
in the outer half of the picture by changing the range.
2. Display the Installation Setup 2 menu.
● INSTALLATION SETUP 2 ●
Select item and option
by trackball.
1. Align Heading
2. Adjust Sweep Timing
3. On Hours 0000019.8 H
4. Tx Hours 0000016.0 H
. . . . . . . . . . . . . . . . .
Press HM-OFF to temporarily
hide menu.
<Press MENU for main menu.>
Figure 3-7 Installation setup 2 menu
3. Select Align Heading by pressing omnipad and press the [ENT] key.
4. Press the omnipad to bisect the target selected at step 2 with the EBL.
5. Press the [ENT] key,
6. As a final test, move the boat towards a small buoy and confirm that the buoy
shows up dead ahead on the radar when it is visually dead ahead.