So I go downtown LA to film around. A bit windy...bad GPS coming and going because of the tall buildings AND a full metal sculpture made from wrecked airplanes at the. Museum. (Should have been a tip off right there!). I get her up 20 ft and a bit wobbly in ATTI but I maintain control. THEN...RED ALERT. COMPASS INTERFERENCE. OH. BAD ****. Into a low bush. Two props. Gone. Could have been worse!