I have read about this problem many times in my long iGO experience - and it has not really been solved yet, as it is related to the calculation of the GPS protocol for the iGO app.
You can easily see whether the real GPS (point on the map) matches the navigation arrow or not if you enter the following in SYS.txt:
[interface]
show_detailed_posinfo=1
+-+-+-+-+-+-+-+-+-+-+-+
PS: even if Android 8 is specified, that doesn't mean that it was actually installed and not "tweaked". The CPU also plays a role
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