Try also this:
Unpack this file and put content in root of iGO:
Spoiler: attach
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Btw:
What exactly happen if you add values from janch post (#2)? But, of course, change value for port from 1 to 5, and add baud rate in it. Mix values, change NMEA_GPSTMC_GNSPORT to IGO_GPSTMC_TUNER...