There are lots of things that people could do to be "nice" and "sportsmanlike." But that has nothing to do with the rules. And, in fact, doing things that are not required by the rules, just to be nice, can actually get you in trouble. Like a starboard boat bearing off to go behind a port boat -- just to be "nice" and "sportmanlike." I have lived to tell you that this can cause a life-threatening and boat-destroying collision.