Trackman - how accurate is it?

Something ive found using simulators indoors, is the matts make a huge difference with alignment.

Something i see on the course and range, is how most golfers set up off target, probably a sub conscious way of correcting. When your indoors with wall, and lines on the floor, many people set up improves.

Similarly, i wouldnt be amazed if trackman doesnt have a level of correction built in. Ive never seen anyone using a trackman painstakingly set it up perpendicular to target lines etc. So i wouldnt be surprised if it detects a dead straigh shot going 5 yards left, it may just assume thats the intended line and correct for it?