More about tacking

Following yesterday's post, today I went out to do some tacks with Robert. We both did some solitary tacks and then practiced standard crewed tacks for a bit. Looking at our GPS track (SW wind), can you guess which ones were which?

To me, this track proves that : (a) a difference between a good and a not so good (but not a strickingly bad) tack is worth several boat lenghts and (b) there is still a lot of room for improvement.