We had a thread going recently about SA. I decided in a time of crisis I would likely underestimate all distances from point A to point B, thus affecting my POA and overall effectiveness. I decided to pace off distances between the most likely defensive positions around my home and points of entry, exit, etc. I have not done the inside yet. However, I mentioned I tuck a Glock 26 in my pockets when I take the dog out for last call at night. I paced off the distance from the garage entry point (I always use this door) to several key points around the yard, driveway, outbuilding, etc. I know it is approximately 25 yards to each major point. From there I can better judge points in between, thinking in fractions to facilitate calculations. Has anyone else done this? Will anyone else do it now?