It should calibrate every time u bind it to tx on start up. If it's just a small drift that gets a bit worse over the flight time then that's just the hubsan I'm afraid. You'll never get a quad minus compass and a gps fix to stay in one place, it will always drift a bit.
when you start it up do you switch tx on, place quad on level surface, connect battery, leave quad still for few seconds before take off? If u connect battery with quad in your hands it can cause similar problems to what you're describing.
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