What should a player do upon discovery of using an illegal club during a round?

When a player discovers they are using an illegal club during a round, the correct action is to notify a referee immediately. This is crucial because the rules of golf emphasize the importance of adherence to equipment regulations. By informing a referee, the player ensures that the situation is handled according to the rules, which may involve assessing the implications of using an illegal club and determining the next steps, such as whether penalties are applicable.

Communicating with a referee also prevents the player from potentially incurring penalties for continuing to use the illegal club or making choices that could further complicate the situation. Properly reporting the issue upholds the integrity of the game and aligns with established protocols for rule enforcement.

In contrast, simply replacing the club with a conforming one without notifying a referee may not resolve issues related to penalties that could arise from the earlier use of the illegal club. Continuing to play with the illegal club is against the rules and may lead to disqualification or other penalties. Returning to the clubhouse to explain the situation does not align with the immediate need to address the violation on the course, as it delays the proper handling of the situation.