When I was training in tracking, the instructor told us that people veer off toward their dominant side. He demonstated by lined us up and telling us to walk in a straight line with our eyes closed. Most of us ended up about angled off to the right.

I've also found that when dead reckoning with a compass I tend to end up some distance off to the right of my objective. This is constant whether I'm going point to point or referencing a more distant point like a mountain peak.