I have a chance to do indoor shooting in a gym over people training. What things did you do before you flew? Obviously GPS isn't happening but did the compass and atti work ok? Did you take off in atti? Did you fly in manual or atti, and did you use home lock or course lock which I thought require GPS, but maybe they don't. Without any wind its probably safer than I'm thinking but I'm concerned about the compass not working in an iron building.