Golf Courses Near Courtyard by Marriott St. Louis Chesterfield

Use this technological marvel with your iPhone to monitor things like ball speed, smash factor and launch angle. Learn why your shots are doing what they're doing.

This caddy on your wrist knows distances for over 42,000 courses. We doubt that Bones Mackay can even claim to have that much knowledge. And the Approach S12 is a bit cheaper than hiring Bones.