Disable GPS to use VIO

I have changd the SYS_HAS_GPS param to 0 and also set EKF2_AID_MASK to 3 , even after this QGC says GPS normal , im running SITL with PX4. How do i completely disable GPS ?

Which version of PX4 are you using?
Which simulator are you using?
Which command do you run to start the simulation?

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The latest version , Currently running it with Pegasus-simulator and issac-sim , I start it using a python script im using something like the 1_px4_single_vehicle.py in this