| NOS |
NIMA |
|
IHO |
Foreign NIMA Charts |
 |
 |
Obstruction, depth unknown |
 |
 |
 |
 |
Obstruction, least depth known |
 |
|
 |
 |
Obstruction, least depth known, swept by wire drag or diver |
 |
|
 |
 |
Stumps of posts or piles, all or part of the time submerged |
 |
 |
 |
Submerged pile, stake, snag, well, deadhead or stump (with exact position) |
 |
 |
 |
Submerged pile, stake, snag, well, deadhead or stump (with exact position) |
 |
|
 |
 |
Fish trap, fish weirs, tunny nets |
|
|
 |
 |
Fish trap area, tunny nets area |
 |
|
 |
 |
Fish haven (artificial fishing reef) |
 |
|
 |
Fish haven with minimum depth |
 |
|
 |
Shellfish cultivation (stakes visible) |
 |
|
