DMW,
Amazing work you did on the QGIS data from the Nano. I will read more of the PDF you shared.
The data from your logs are indeed in the Safecast database. However, the current map is not updated after September 2023. A long story. But we are still working on a replacement.
FYI . Upcoming firmware for the bGeigieZen will allow you to directly send the data to the API without taking the sd card out.
Regards
Rob Oudendijk