On land, in rough terrain, it is a different story. There you will typically be traveling uphill or downhill and with the aid of a good map, it is very easy to keep on the proper course to a destination.
Easy? That depends on a whole bunch of variables. But I have used knowledge of the terrain to that effect with considerable success, but I rate this as being highly location specific.
Sorry, I wasn't clear. In rugged terrain, it is easy to know where you are; it may be very difficult to travel, but at least you know you are not walking in circles. Usually you become slotted in a canyon or on a ridge, and there you are. I am talking about country that is typically off limits to snowmobiles. It does indeed become harder to maintain direction once you get on flatter terrain.