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onstar fuse is under the hood. It's pretty obvious from the label.
GPS signal for navigation comes from a dedicated gps receiver that is directly connected to the HMI unit. It doesn't use onstar gps.
The dashboard compass does use the onstar gps ... so it will show "CAL" or nothing when you disable that.
The onstar module also controls the in-car microphone, so if you totally cut power to the unit, you will lose voice controls (this same microphone is what is used with android auto and carplay).
I'd recommend either killing the module via the fuse if you dont care about the microphone or removing the radio board. Unless you have some kind of replacement antenna wire that filters out the signal or totally blocks it while mimicing the same load as the antenna to ensure you dont damage the module (always a good rule to never run a transmitter without an antenna)
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