| NOS | NIMA | |
Foreign NIMA Charts |
|---|---|---|---|
 |
Rock awash (height unknown) | |
|
 |
Shoal sounding on isolated rock or rocks |
 |
|
 |
Sunken wreck covered 20 to 30 meters |
 |
|
 |
Submarine volcano | ||
 |
Discolored water | ||
 |
Sunken danger with depth cleared (swept) by wire drag |
 |
|
 |
Reef of unknown extent | ||
 |
 |
Coral reef, detached (uncovers at sounding datum) | |
 |
 |
Submerged Crib |
 |
 |
Crib, Duck Blind (above water) | ||
 |
Submerged Duck Blind | ||
 |
Submerged Platform | ||