Automatic Compass Deviation Check (Auto Chk); Cancel Earlier Performed Compass Deviation (Auto Clr); Compass Misalignment Correction (Adj) - Furuno FI-301 Operator's Manual

Note: You will get the best result in calm water with a smooth turn on the
steering wheel independently of how the circle is performed. When activated,
you can stop the automatic compass deviation at any time with a press on
CLEAR.

12.4.2 Automatic compass deviation check (Auto CHK)

(Auto CHK) is done by driving the boat in a circle up to 1 ¼ turn,
after (Auto DEV) is performed. The result will be compared with
(Auto DEV). If the deviation is less than 1,5*, the average value
from the comparison between (Auto DEV) and (Auto CHK) will
be stored.
If the check is OK, (Auto CHK) will be displayed.
If not an error message will be displayed.
Select automatic compass check (Auto CHK), press SET and repeat the same circle
manoeuvre as described in the (Auto DEV) routine.
Note: As soon as you place any kind of ferrous items close to the compass, the
(Auto DEV) / (Auto CHK) routines should be repeated. So if you have packed your
boat for the vacation, think about where you place ferrous items in relation to the
compass transducer.

12.4.3 Cancel earlier performed compass deviation (Auto CLR)

To cancel earlier (Auto DEV), press SET.

12.4.4 Compass misalignment correction (Adj)

Compass transducer misalignment correction or the so called "A-fault".
Can be set between 000°and 359°. Allows 180° reversed mounting if needed. Never
mount the transducer in a 90° position relative to the boats fore-aft line.
To check the transducer position, sail/drive your boat in a straight line towards two
visible objects in a line. If the actual heading taken from the sea chart is 330° and the
compass displays 335°, then set calibration code C36 value to 360° - 5° = 355°.
44