I prefer changing one of the mode switches to enable ATTI mode in case of any unexpected flight behavior.
https://r.tapatalk.com/shareLink?share_fid=1514257&share_tid=46782&url=https%3A%2F%2Fmavicpilots%2Ecom%2Findex%2Ephp%3Fthreads%2FMavic-2-Atti-mode%2E46782%2F&share_type=t
No compass errors. The magnetic fields produced by the rebar within the concrete extend less than 12 inches above its surface. Try using this iOS app and you’ll can test out your environment.
https://apps.apple.com/us/app/metal-detector-pro/id381166202
The rebar within concrete can result in a bad compass initialization if you start your drone from it surface. I power up the Mavic hand holding it above my head. I can then fly in close proximity to rebar with no problems.
It shows aircraft & distance (no altitude nor speed)
It does not differentiate between helicopters & airplanes.
It does give a nice red warning when aircraft gets relatively close.
Just wanted to share how well active track worked in this situation with the ability to control whether it follows the subject from behind flying forward or faces the subject flyingbackwards
Personally, I prefer to check for magnetic interference independently of the Go4 App .... see my post #37 in this thread:
https://r.tapatalk.com/shareLink?share_fid=67544&share_tid=140162&share_pid=1408495&url=https%3A%2F%2Fphantompilots%2Ecom%2Findex%2Ephp%3Fposts%2F1408495%2F&share_type=t
You should be okay.
For the first 30ft AGL, you will have downward facing VPS
Then as you ascend, you'll get eventually get GPS..
Here's a Phantom2 flying in ATTI from 5 stories below street level to then ascend & acquire GPS.
Here's my very basic explanation:
1. GPS tells the aircraft its position on earth (doesn't control altitude, its barometer does that)
2. Compass tells the aircraft which way is North. They work together to keep the aircraft hovering in one place.
3. See attached diagram; In this example...
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