I just bought a standard Navspark, and attempted to just get serial output from the board. I set up the IDE (64 bit Linux), and uploaded a Hello World program:
It uploads successfully, but when I open the Serial Monitor I get a whole bunch of garbled text, like "BB!cXJ������)�T i�VFy...". The monitor is set to the correct baud rate, the processor is set to the one without GNSS library (I've tried switching it, it doesn't make any difference), and the board is set to "Navspark (GPS)", and I can't really think of anything else to check. Any suggestions?