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InfluxDB
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PyGPSClient
Python Graphical GPS Client Application supporting NMEA, UBX, RTCM3, NTRIP & SPARTN Protocols
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rpi-eeprom
Installation scripts and binaries for the Raspberry Pi 4 and Raspberry Pi 5 bootloader EEPROMs
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Unfortunately a Raspberry Pi is a bit ill suited for production environments. Id recommend an RTC module. Otherwise this might be helpful: https://github.com/hcfman/sbts-aru
As for the GT-U7, this software can be used to avoid Windows, it seems:
https://github.com/semuconsulting/PyGPSClient
In OpenWrt (Linux distro for routers that often don't have RTC) dnsmasq starts with `--dnssec-no-timecheck` until the ntp client gets a first sync (https://github.com/openwrt/openwrt/commit/5acfe55d7139a52941...)
I don't have Pi 5 to check this, but from what I've read, it does not support PPS. And such support is required; otherwise, even with a source that supports PPS, the connection will behave in a non-PPS fashion.
Apparently, cable quality is also demonstrating itself to be a significant factor in the Pi 5 power supply environment.
Regarding both these points:
https://github.com/raspberrypi/rpi-eeprom/issues/497