Table 6. — Swell amount 



Code 



Table 7- Visibility 



Dense fog 50 yards 



1 Thick fog --- 200 yards 



2 Fog ij-OO yards 



3 Moderate fog 1000 yards 



k Thin fog or mist 1 mile 



5 Visibility poor 2 miles 



6 Visibility moderate 5 miles 



7 Visibility good 10 miles 



8 Visibility very good 30 miles 



9 Visibility excellent Over 30 miles 



13 



