Apologies, I feel like I ask too many questions, just have a curious mind. 
last one before I take a break for Christmas.
1. Wind simulation - How in-depth is the actual core? (is there an article to read about the design) I've never flown the gliders, but have read thermals are simulated quite well. Does wind flow around objects? When parked at the gate, and looking at IRS winds, it seems to change depending on my location, or if a building is next to me.
2. I've noticed in the system.tmd that GPWS Terrain Ahead & Obstacle Ahead are included. Is the Obstacle ahead just a placeholder? What would trigger it in the sim? (Real world is using an obstacle database)