I asked the same question to firstname.lastname@example.org and got this answer: “We have not but we have heard Emlid has helped customers do so.”
andrew.yushkevich confirmed by PM that Survey 3 camera worked with a special version of the Survey 3 firmware. In PM he states that: “As I know they don’t have the possibility to integrate Mapir 3 with Reach now. However, you can ask their support about that. Maybe they added this functionality officially.”
I think Emlid tested the Survey 3 camera with the STANDARD GPS Firmware installed, and it did not work, as it only supports $GPRMC messages. Then they got custom firmware from MAPIR that supports $GNRMC messages, and it work with that firmware. Maybe andrew.yushkevich can confirm this?
I suspect that MAPIR later has released the advanced GPS module that supports Glonas, and with that they have released the ADVANCED GPS Firmware that supports $GNRMC messages. Hopefully Survey 3 with the ADVANCED GPS Firmware installed supports Reach M+, but has anyone tested it?