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Basically the advise there is - turn off Beydou.
This is quite simple, the command can be send to Serial any time.
Another interesting item in the article to check GPS antenna soldering. http://members.optuszoo.com.au/jason.reilly1/868mods.htm?fbclid=IwAR3We8hIt20lFBOhBdOoGneDnTRfB2PTQAMff1Tsupw06QlFLPlOnOnBRLE#FasterGPS
Yes, it is different device - radio. But who knows, NMEA shows antenna is off, may be it is. Gordon, if you have disassembled watch, could please you take a look if soldering there is done properly?
Mark_M
I posted this up in some previous conversation, but had trouble finding it now, so: https://github.com/geary/AnyTone-D868UV/issues/61
Some interesting info about improving time to GPS lock there