The standard Move Action is to, um... move... your Speed in yards. You could use miniatures and a battle mat (with a scale of one yard per hex/square) to keep track of character movement and position, but this isn't necessary by any means.
Position does matter, though, even if you choose to track it abstractly. One important aspect of combat movement is that characters must be adjacent (defined as within three feet of each other) to engage in melee combat. Another is that different ranged weapons have different effective ranges, also measured in yards.