Simrad AP26 Manual De Usuario

Maintenance 

20221586B

 99 

4. When the calibration is completed, (after having made 

approximately 1 1/4 turns), it will be confirmed by the display 
reading “Confirmed”. 

Compass deviation 

The heading from a magnetic heading sensor will normally have 
a deviation when compared with the actual direction of the 
earth’s magnetic field. This is caused by interference from the 
boat’s local magnetic field. The deviation will be at a minimum 
if the compass is placed as far as possible from any magnetic 
object on board. On the other hand, you may have to 
compromise with other requirements for the installation of the 
compass (page 65). 
During the calibration, the compass will measure the magnitude 
and direction of the local magnetic field from where the compass 
is mounted. The magnitude is given in % of the magnitude of the 
earth’s magnetic field. If the local magnetic field is stronger than 
the earth’s magnetic field (the local field is reading more than 
100%), the compass calibration will fail. If the local field is 
reading more than 30%, you should look for any interfering 
magnetic objects and remove them, or you should move the 
compass to a different location. The local field angle will aid you 
to the local interfering magnetic object. See drawing. 

Lubber line 

Lubber line 

 

 

 

 

Magnitude of local 
field in % of 
earth’s magnetic 
field. 
Direction of local 
field with respect 
to lubber line. It 
can also be on the 
reciprocal. 

Note !