As long as the drone pointer on the app shows a direction consistent with the physical heading of the drone, ie, pointer towards north when drone heading is north I wouldn’t calibrate the compass unnecessarily. Even if there was an inconsistency...
Here's something that most people don't know.
The United States is not the only place in the world where people exist.
Can you imagine how crazy it is for someone outside the US to want to buy a drone.
The mind is boggled!!
Customs can, should they feel like it, ask you to show proof of purchase of items valued over $800, manufactured abroad, but purchased in the US. If you cannot, they can charge you import duties. You can appeal, but your children may be alive to...