Sight Marks

Just in case I lose my book

 

YARDS SIGHT MARK   METRES SIGHT MARK
20 4 (12, X7's)   20 3
30 17   25 19 (23, X7's)
40 30   30 25 (28, X7's)
50 43   40  
60 56   50 50
70 69   60  
80 82   70 75
100 Hole 2, 87   90 Hole 2 , 86