Airborne magnetic data provide a means for guiding reconstructions of Precambrian continents, in particular the hotly debated western continuations of Laurentia, in that the magnetic data tie existing isolated interpretations of geologic units through continuous data coverage, provide plate scale views of geology and tectonics and extend interpretations of units buried beneath cover. The aim of this paper is to demonstrate the approach of using reconstructed magnetic data to evaluate the SWEAT plate reconstruction. The first step is to identify key piercing points in the SWEAT plate reconstruction model, determine the sources of magnetic anomalies associated with those piercing points and then match anomalies across continental boundaries.