by JussiH » Fri Jan 22, 2016 1:18 pm
The mag is only used to estimate initial heading on bootup, but its only relevant if you plan to fly using GPS.
Inside a building you wont be using GPS, so there wont be a problem. But I would recommend disconnecting the GPS antenna to make sure you dont get a lock inside (this can happen in rare cases).
I think we will soon release a new firmware that gives the option to fly in altitude hold, only depending on ACC and Baro, which is ideal for indoor flights.
But if there is no GPS available, its gonna be effectively the same as flying in altitude hold.