Someone in the comments mentions that they use it when flying into an unfamiliar airport to learn the terrain. I often wondered if Special Forces or Swat Teams

Someone in the comments mentions that they use it when flying into an unfamiliar airport to learn the terrain. I often wondered if Special Forces or Swat Teams could use an FPS for a similar purpose to learn the layout of a building they are going to assault or infiltrate. I'm pretty sure you could drop me anywhere in the first level of Doom and I'd know where I was.