NOAA S-57 chart cell
Potomac River
US4MD40M
- Usage band
- Approach · code 4
- Current edition
- 24.0
- Features
- 3,773
- S-57 layers
- 57
- Published
- Jun 17, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 38.88639° N
- South
- 37.92353° N
- West
- 77.49952° W
- East
- 76.45052° W
- Center
- 38.40496° N, 76.97502° W
- Bounds area
- 2,853 sq nm
- Feature density
- 1.3223 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 66.2
- Smallest layer
- 1
- Largest layer
- 1,204
- Area sq km
- 9,786
- Features per sq km
- 0.38553
- SLCONS Shoreline construction 1,204
- COALNE Coastline 431
- DEPCNT Depth contour 268
- LNDRGN Land region 251
- DEPARE Depth area 249
- PILPNT 189
- OBSTRN Obstruction 159
- LNDARE Land area 102
- SEAARE Sea area 91
- DAYMAR 88
- BCNLAT Lateral beacon 77
- SBDARE Seabed area 69
- LIGHTS Light 62
- WRECKS Wreck 41
- BCNSPP Special purpose beacon 39
- M_QUAL Data quality 38
- CBLOHD 37
- OFSPLF 37
- RIVERS River 35
- BOYLAT Lateral buoy 32
Nearby Chart Cells
Approach usage band
Current Edition Files
The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4MD40M.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MD40M/24.0/US4MD40M.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD40M/24.0/US4MD40M.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD40M/24.0/US4MD40M.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD40M/24.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 24.0 | Jun 17, 2026 | metadata.json |