Hello Tom,
Welcome.. I also just got started.. I ended up with a wkm though. I would recommend you post on the DJI section of this forum. This forum has helped me out alot since, I have never flown any RC before.. so Lipo battery charging was also new, futaba programming, and so on.. only thing I had to start was some soldering experience.
Hope you get your drifting in gps taken care.
FYI: there are talk about naza GPS updates, mounting of GPS close to electronic, software version and settings on the assistance... lots of different things. What is helpful if you video the flight, post on youtube or something and reference the video in the post so that experience users can give their 2 cents...
Hope you enjoy.
Welcome..
KS