MGL Avionics Stratomaster Ultra Horizon XL Owner’s manual
Page 61
Place your aircraft in flight attitude. For example, if you own a tail-dragger, raise the tail. Some
tricycle gear aircraft may need to raise the nose gear slightly. The object is to place the sensor
package as close to horizontal attitude relative to the earth’s surface as you can.
Press the “+” key or have an assistant do this for you if you are busy holding up your aircraft’s tail.
Proceed as instructed and turn the aircraft through a full 360 degrees at least once. Allow this
procedure to take some time, perhaps a minute. You can proceed to turn your aircraft though two
or even more turns but you need to fully complete at least one turn.
You will see the instrument tracking minimum and maximum values for each sensor and you can
see the current values.
Once you have completed your turn(s), press “+” again to inform the instrument that you have
finished.
Your instrument will at this point calculate a best possible fit of the sensor data to a 360 degree
arc taking the relative strengths and offsets of the magnetic field into account.
This procedure can result in remarkably good overall performance of your compass.
Please note: After this procedure has been completed, you may have to verify the compass
performance by performing a normal compass swing. Should any deviation remain, you need to
note this on a deviation card and place this card next to the compass.
This may be a legally required procedure in your country for your aircraft class. Please check
your relevant regulations.
Deviation compensation and compass swing may need to be repeated from time to time as the
magnetic properties of metals in your aircraft may change over time.
