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In the description of the Ardupilot integration of Reach M2 and Reach M+ it is stated, that:

Then set SERIAL4_PROTOCOL parameter to "20" - NMEA Output. This will enable Serial4 port to be used as NMEA output.

(The statement itself is correct but at this point you don't want that. You want the Ardupilot to know that there is a GPS attached and it can use it as an NMEA Input)

I tried a lot but for me it only works when setting it to "5" - GPS.

In my opinion this is an error in the description.

Mission Planner: 1.3.74
Ardupilot: ardurover-4.0

The order of commands for building Ardupilot is wrong
(see: ArduPilot/ardupilot#14526)

Didn't make a pull request as it maybe should also be changed in the other descriptions (Copter etc.)

Concerning the ERB Protocol Specifciation

The packet structure graphic shows the 2 sync chars as 1 = "R" and 2 = "E" which is the wrong order imho. Apart from that the order seems to be correct in the following descriptions.

I didn't find any information to the Antenna Phase Center offsets in the docs for the RS2 receiver.
Only in the forum someone mentioned it https://community.emlid.com/t/rs2-question-measure-point-to-apc/17233

Would be nice to have this information also in the documentation (from an official source) somehow like for the M2 receiver https://docs.emlid.com/reachm2/specs/

This issue was created to test the notifications.

I tried to use the recommended image by the documentation here https://github.com/emlid/emlid-docs/blob/master/docs/autopilots/common/ardupilot/configuring-raspberry-pi.md, however ran into the following issue: emlid/pi-gen-navio#4

Looking a bit deeper, navio-stretch is the default branch not navio-buster, I believe the navio-buster link has been updated to the documentation prematurely. Should the link be changed back to the stable and working navio-stretch one, instead of navio-buster? At least until the navio-buster branch is the default one for generating the navio image?

Under what terms can the documentation be used?

See https://choosealicense.com/no-permission/

It seems to be a common problem that downloading DataFlash logs through Mavlink may be very slow. Thanks to this forum topic https://community.emlid.com/t/can-download-dataflash-log-but-cant-find-on-sd-card/13803/5 I could download the log files directly from Raspberry in seconds with WinSCP.

Please check the /var/lib/ardupilot/logs folder.
You should look for .BIN files, not .bin.

I am not sure where in the documentation would be the best place for that valuable piece of information.

mining sights > mining sites

It was always a pain for me not having the rtl8812au as an upstream kernel module. Fortunately at least now there is a fork that is maintained much closer to upstream. I just installed it for 5.5.5 and it's working fine:

https://github.com/gnab/rtl8812au

It would be nice to get the quickstart page updated with this info.

Could you tell me the voltage level(s) of the RS232 output?