He then replaced his ball and putted without picking up his marker. I told him his ball was not in play because he left his marker in place, and thus had hit a wrong ball — he needed to replace ...

The spot of your ball must be marked with a ball-marker or with your club. A ball-marker is an artificial object such as a tee, coin, or other object made to be a ball-marker, or another small piece ...

If a ball-markerBall-Marker: An artificial object when used to mark the spot of your ball to be lifted, such as a tee, a coin, an object made to be a ball-marker or another small piece of equipment.