NOAA S-57 chart cell
Potomac River - Piscataway Creek to Washington, D.C.
US4MD1DB
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 2,287
- S-57 layers
- 55
- Published
- Apr 2, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 39.00000° N
- South
- 38.70000° N
- West
- 77.10000° W
- East
- 76.80000° W
- Center
- 38.85000° N, 76.95000° W
- Bounds area
- 253 sq nm
- Feature density
- 9.0514 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 41.6
- Smallest layer
- 1
- Largest layer
- 428
- Area sq km
- 867
- Features per sq km
- 2.63896
- SLCONS Shoreline construction 428
- DEPCNT Depth contour 233
- COALNE Coastline 222
- DEPARE Depth area 211
- LNDRGN Land region 118
- OBSTRN Obstruction 92
- BRIDGE 81
- LNDARE Land area 75
- PILPNT 60
- BUISGL 56
- MORFAC 54
- M_QUAL Data quality 51
- DAYMAR 46
- SBDARE Seabed area 46
- RIVERS River 45
- LIGHTS Light 44
- BOYLAT Lateral buoy 42
- BCNLAT Lateral beacon 40
- WRECKS Wreck 39
- UWTROC Underwater rock 36
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/US4MD1DB.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MD1DB/1.0/US4MD1DB.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD1DB/1.0/US4MD1DB.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD1DB/1.0/US4MD1DB.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD1DB/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 2, 2026 | metadata.json |