uAvionix AV-30-E Installation Manual page 61

Use the rotary knob to step through each system in the checklist and
monitor the magnetic field deviation value.
The deviation value indicates the magnitude and direction of the
magnetic reading with respect to the Earth's magnetic field. A relatively
small deviation near zero indicates little or no magnetic field
interference, while a larger negative or positive deviation indicates the
AV-Mag is sensing magnetic fields in addition to the Earth's.
At the end of the checklist, a REVIEW screen identifies which systems
caused the largest deviations. Identifying systems that cause
interference, especially those that generate temporary magnetic fields,
can aid in proper site selection for installing the AV-Mag. The
interference range indicates fluctuating magnetic fields which will
negatively impact calculated magnetic heading values, so a good
installation requires this range to be as small as possible. If the range is
greater than 10%, attempts should be made to re-site the AV-Mag
location or to mitigate interferers.
UAV-1004234-001, AV-30-E Installation Manual
Rev H
61