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@Mark_M
may be internally fix is 60 bytes, but each time the chip issues all NMEA messages to UART(in our case). there is much more bytes.
There were dozens of meters between terminals and mainframes. That is why 9600. Here is barely 5 mm between chips in the watch. So there should be another reasoning for setting a baud rate - mainly related to power consumption.
Again, could anybody confirm or oppose that I am configuring the Serial1 correctly, are the pins correct? Should I turn GPS power off before the reconfiguration?
(I did that previously with other boards and uBlox, and did not have these issues. But there I knew what pins I connected GPS to.)