| NOS |
NIMA |
|
IHO/Foreign NIMA Charts
|
 |
Limit of dredged area
|
 |
|
 |
Dredged channel or area
with depth of dredging in meters |
|
 |
 |
Dredged channel or area
with depth and year of the latest control survey |
 |
 |
|
 |
Dredged channel or area
with maintained depth |
|
 |
 |
Depth at chart datum, to
which an area has been swept by wire drag. The latest date of
sweeping may be shown in parentheses. |
 |
 |
Unsurveyed or
inadequately surveyed area; area with inadequate depth information
|
 |
