Nah, no Heliport anywhere nearby , and I also checked with UAV forecast prior to launch in case I was missing one (not that it couldn't be wrong, but it's usually pretty good).
I suspect the reason is as BudWalker was suggesting, heavy interference from the metal structure in the parking garage threw the compass off during initialization of the bird. Then once it cleared the interference and started producing accurate compass readings, they didn't jibe with where the GPS thought it should be so it started failing over into ATTI.
Still bothers me that Litchi didn't indicate any errors onscreen until it was a few hundred feet up.
DJI Go would act same. I took off from a terrace with lots of rebar reinforced concrete and got compas error/atti/drone tilt when I was 600ft/2 minutes out.
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