I am using QGIS 3.10 together with a ArdusimpleRTK2B Board based on U-Blox ZED F9P processor and a Windows 10 based tablet computer.
Using a SAPOS correction service and having connected it via gpsd the board provides cm-precission NMEA Strings $GNGGA and $GNRMC. The position of the cursor in the map exactly shows the position of the antenna.
But I wonder, why QGIS does not show values for speed, direction, quality,... in the GPS-Information Box? What kind of NMEA-data does QGIS expect to show those properly?
Answer
Similar to the other post, Nyall Dawson and others have been making massive changes to the GPS handling in QGIS. I don't see $GPVTG, which looks like the NMEA message you need for speed.
This Pull Request should give you what you need for constellation/satellite quality.
These PRs have been merged into master, but I don't see a milestone for their release. I'm guessing for 3.12, but I don't have a way to confirm for sure.
GPS - add support for additional messages #33239
https://github.com/qgis/QGIS/pull/33239
Adds support for some additional NMEA message handling to the GPS tools, fixes some issues
[gps] Support GNGGA nmea messages
[gps] Support GNGSA messages
[gps] Support GNGSV messages
[gps] Add support for GPHDT heading from true north messages
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