@Eric-Katzfey I have uploaded the screenshot with output of ls /etc/modalai command 
I was able to arm and fly it in Manual model, the 'COM_ARM_WO_GPS' parameter value is set to 1.
In fact, I want to arm it in Position mode and it still shows a warning of 'Horizontal gps error is too high' and the error 'Obstacle avoidance is not ready'.
E
Emon_dey
@Emon_dey
Posts
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Can't arm the Sentinel Drone. -
Can't arm the Sentinel Drone.Hi:
I am trying to fly the Sentinel drone for the first time. In the, QGC, it is showing 'Not ready' and in the expansion of the error, I can see two things, 'Horizontal gps error is too high' and 'Obstacle avoidance is not ready'. I tried disabling gps and it shows 'Ready to fly' but the drone is not arming. Another thing I noticed, I don't have a 'voxl-px4.conf' file under /etc/modalai folder. Any direction would be greatly appreciated.