Calm down. You're anxious. But don't blame you. New Spark and, darn, raining outside!!! You aren't getting GPS, thus you are in atti mode. GPS has no reach inside a building. You have to be in open air, outside, to get GPS signals from those umpteen satellites. Careful inside. You could easily break props hitting something.
The rain and bad weather in general is there for a reason when you first buy a drone. It is to give you plenty of time to read the manual before you fly the AC.
Looks like you are being methodic, logical and cautious in your new endeavor. Great. You'll be a good pilot. I have a Mavic and a Tello, both ends of a spectrum, but the Spark is right there in them middle with unique abilities and very versatile, a fun, responsive, capable drone. I hope you enjoy it a lot like I do mine.
Clouds do not interfere with GPS reception. Does heavy cloud cover affect GPS reception? - GPS Tracklog
I agree with the person that posted that gps does not each indoors and I would like to add that it would be better to setup where you are going to fly to get true readings set up your compass were there is not metal object to throw it off . over the ground that you will be flying over. Metal in a building or in a side walk could effect your compass.
