Below you find the layout of camp of a Roman army on the march. Every night the legion would halt and erect a camp in this layout. As every Roman force used the same scheme, this meant that every soldier always knew where to find everything. Also this meant that when a soldier would enter the camp of another legion, for example when delivering a message, he would always know where to go.
Notice that the legion's standards have their place reserved at the center of the camp; in fact they had their own tent.