SV-MAG-236 Installation and Configuration
20-2 SkyView System Installation Guide - Revision AA
Tail wheel equipped aircraft can be calibrated in their normal nose up ground attitude
as long as the SkyView attitude display shows the correct corresponding nose up
attitude.
A working GPS receiver with a view of the sky to acquire GPS data must be connected
to the SkyView system in order to perform a compass calibration. SkyView uses GPS-
derived position information to calculate magnetic intensity, declination, and
variation.
During the on-ground compass calibration it is important to perform the compass
calibration in an area that has been verified to be magnetically neutral. The presence
of steel reinforcement (rebar), electrical power lines under the tarmac, or other
natural deposits of ferrous metals can result in an inaccurate compass calibration.
Airport compass roses are usually verified to be magnetically neutral and thus are
often a good location for performing a compass calibration.
For more information on this issue see FAA Notice Number: NOTC4031:
https://www.faasafety.gov/files/notices/2012/Aug/CAUTION_TLP_031612_Rev10.pdf
On-ground Compass Calibration Procedure:
1. If you have two SkyView displays, the in-flight compass calibration can be performed
from either display.
2. Turn on the SkyView system and allow it to warm up for a minimum of 5 minutes.
3. Move the aircraft into position so that it is convenient to orient it in the four cardinal
directions.
4. Enter the Setup Menu on the SkyView display and go to the Compass Calibration Wizard
(SETUP MENU > HARDWARE CALIBRATION > ADAHRS CALIBRATION > COMPASS
CALIBRATION). Note - GPS data on the Compass Calibration Page must be green. If it is
red, GPS data is not valid. You will see a screen similar to this:
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