SV-MAG-236 Remote Magnetometer Installation and Configuration
8-2 SkyView HDX System Installation Manual - Revision E
Move a handheld compass throughout the space surrounding your intended
location to get a rough idea of the suitability of the area. Note that this test
should be done with major aircraft systems operating (e.g., strobe lights and
radios on) because some systems can cause magnetic interference. If the
compass needle deviates significantly from magnetic North or cycles back
and forth, the location is not ideal for SV-MAG-236 installation.