Geomagnetic Survey of the Compass Swing Testing Site at Nelson Airport

Abstract

A survey of Total Magnetic Field Intensity (TF) was conducted across the compass swing testing site at Nelson Airport on 2 July 2019, in accordance with the requirements stipulated in the Civil Aviation Authority Advisory Circular AC43-7 Revision 1 (CAA AC43-7). The variation in TF anomaly across the site was 8.06 nT, equivalent to a maximum possible horizontal deviation of magnetic North by 0.026°; this is 26% of the permissible deviation of 0.1° for a CAA AC43-7 Class 1 site. This result confirms that the Nelson Airport compass swing testing site qualifies as a Class 1 site.