What happens if I use illegal green-reading material and get disqualified?

Yes, you are disqualified. If you use a green-reading book or material that exceeds the allowed scale (3/8 inch to 5 yards) or contains more detail than permitted, the penalty is immediate disqualification under Rule 4.6. There is no warning or stroke penalty first — it’s straight DQ.

What counts as illegal green-reading material

Any green-reading material that shows more detail than the allowed scale of 3/8 inch to 5 yards (1:192) is prohibited. This includes commercially produced books with detailed contour lines, slope percentages, or break diagrams that go beyond the limit. Hand-drawn notes you make during the round are allowed, but pre-prepared detailed maps are not. The rule applies to both physical and digital materials.

What if I didn't know the material was illegal

Ignorance doesn't change the penalty. If you use a non-conforming green-reading material during a round, you are disqualified as soon as the breach is discovered. It doesn't matter if you bought it thinking it was legal or if someone gave it to you. The responsibility is on the player to ensure any material used meets the Rule 4.6 limits.

Can I use my own notes or a yardage book

Yes, you can use notes you or your caddie have made during the current round, and you can use a standard yardage book that only shows distances and general green shapes without detailed slope or break information. The key is the level of detail: if it helps you read the break beyond what the naked eye can see, it's likely over the limit.

Exceptions that change the answer

• The material meets the scale and detail limits of Rule 4.6 → It is permitted and no penalty applies.

Frequently asked questions

Is the penalty always disqualification, even for a first offense?

Yes. Rule 4.6 carries a single penalty: disqualification. There is no general penalty (two strokes/loss of hole) for a first breach — using prohibited green-reading material results in immediate DQ.

What if I only looked at the book but didn't use it for a stroke?

Looking at prohibited material during the round counts as using it. The rule says you must not use such material, and referencing it for any reason during play triggers the disqualification penalty.

Does this apply in match play and stroke play?

Yes. Rule 4.6 applies in all forms of play. The penalty is disqualification in both match play and stroke play.

What if my caddie uses the illegal material but I don't?

If your caddie uses prohibited green-reading material during the round, you are disqualified. The player is responsible for the caddie's actions under Rule 10.3c.