It's actually quite "daring" fitting so many functions into such a small space. There are however, two features which I don't quite understand. The red ring is marked 15 to 180 deg. Do you know what this is for? (180 deg is half a circle but it's clearly a full revolution. Similarly, 90 deg is marked where 180 deg would ordinarily be). Also, what's the big triangle at the 30 min chronograph counter about?