The starter at Providence Golf Club informs golfers which placement the flag will be for the day. Just before chipping on to the green, golfers can check the car to get an idea about how the green is shaped and how much space on the green there is for the ball to roll to the hole.
Other golf courses may not be as sophisticated in their pin placement. Some golf courses don't have starters and the club pro or person at the cash register when ringing up your green fees will tell you.
Some golf courses only use the color of the flag to indicate pin placement. Again, the golf cart, or the score card will tell the golfer what the color of flag means. Not all golf courses change their flag color or provide a map. Then it is up to the golfer to estimate based on experience (and sometimes a sneak and peek drive ahead) to determine where the hole is.
Why is it important to know pin placement if you have a distance reader?
Pin placement maps show you how much space surrounds the flag. Depending on the space around the flag, you may choose to have a chip with more or less loft. Hazards will also affect the decision.