I heard that it has one page for each fairway, one for each green and one for each CTTH shot. You can
- write in it before you change to the next situation, i.e. mostly before the shot, and only in single mode. That is, make a note about your perfect approach before the ball hits the green, and pray that it's not in a match => paper memory necessary.
- read in it while you're on the hole (not in advance, not in hindsight), also in multiplayer games.
AFAIK, you cannot browse through holes when not playing them - too many limitations IMHO.
Me thinks it's one of these half-bread money-making ideas like "bag plus" which has to be unequipped before selling unequipped clubs.