167.406—Off San Francisco: Area to be avoided.
         A circular area to be avoided, with a radius of half of a nautical mile, is centered upon geographic position:
    
    | Latitude | Longitude | 
|---|---|
| 37°45.00′ N | 122°41.50′ W. | 
| Latitude | Longitude | 
|---|---|
| 37°45.00′ N | 122°41.50′ W. |