According to Apple Documentation it looks like only GPS is used in core location as that is the only requirement in the property list. However, many websites claim that iPhones have support for GNSS and incorporate it into the core location? Does anyone know how to access the satellite signals raw to do our own calculations? Does anyone have any information on this? If Core Location already incorporates QZSS then I do not have to worry, but if not then I would like to try incorporating it myself. The only other post I found was 6 months old with no responses, but maybe I can find something here? Thank