It's 150 yards to the pin, which club are you going to hit?
Do you have a GPS enabled smartphone?
If you don't know the answer to the first two questions (and the
answer to the third is yes), buy Pick the Right Club. It will be
your on the course assistant; measuring the distance you hit each
shot, storing the distance and club, and reporting that information
while you play.
Statistics are gathered during each round and displayed on screen.
More importantly, all shots are saved and can be sent to your email,
allowing you to see a history of your rounds, detailing each and
every one of your shots, broken down by club, for you to analyze
any way you would like.