hehhe...re errors in real life:...
Thats be cause the simulators believe in a perfect world with perfect mathematics and nglect the fact that a VOR can have up to 7.5deg of error in total (tx & rx error combined). Indeed the ADF is really only 5deg as well. Given that DME is based on slant range - never expect it to match ground distance - because at 6080' it will read 1nm.
And that is where the real art of flying comes in....oh yeah and ive never yet met a simulator that jiggles your body soooo much its hard to see the screen