Interesting! Thanks for sharing. It looks like there is a typo on the Beidou Wikipedia page, as in the text it says B1C is 1572.42 but the table matches the above value of 1575.42, as does the cited source at http://www.unoosa.org/documents/pdf/icg/2017/05_icg12.pdf. This isn’t the exact value of 1575.450 that we’re seeing in the app, but it’s close enough that I’ll make GPSTest consider it as a match.