For a Phantom 4 pro, you need DJI Go 4.
Any version should work properly.
But your K1 tablet is stone age and expecting it to run properly might not be realistic.
It's the tablet I started flying with way back ten years ago.
You can use your batteries in any Phantom 4 series drone.
But you don't need to run the motors to discharge the batteries.
You can set the battery to automatically discharge to storage level in 1-10 days in the app settings.
Probably not necessary since you won't get GPS under all that concrete.
There's no need to calibrate the compass, because the drone never loses its calibration.
DJI's warning is badly worded and confuses users.
It's telling you that the compass sensor is detecting a magnetic field greater than...
You can't install 3rd party apps on the GL300E controller.
But if you can find a GL300F controller, you can use that with the drone.
You would also need to buy a tablet or use a phone with the controller.
Many drones have been lost because they were powered up on a reinforced concrete surface where hidden steelwork was close enough to the compass sensors to deflect the compass giving it a false reading.
If the magnetic field is stronger than what the drone is expecting, it will bring up a compass...
There are two reasons that this is ringing alarm bells for me.
There is no need to recalibrate the compass before a flight.
That you are, indicates a poor understanding of what compass calibration actually does (and doesn't do), and when it might be needed (almost never).
There was nothing...
400 ft is too much clearance above terrain for most flying.
It would mean an unnecessary, battery-wasting climb and possibly put the drone up in higher level winds that could be another issue.
It's better to set an RTH height to suit wherever you are flying and whatever obstacles are there.
It...
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