NOAA S-57 chart cell
Potomac River - Port Tobacco River and Piscataway Creek
US4MD1CB
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 1,043
- S-57 layers
- 38
- Published
- Apr 2, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 38.70000° N
- South
- 38.40000° N
- West
- 77.10000° W
- East
- 76.80000° W
- Center
- 38.55000° N, 76.95000° W
- Bounds area
- 254 sq nm
- Feature density
- 4.1106 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 27.4
- Smallest layer
- 1
- Largest layer
- 255
- Area sq km
- 870
- Features per sq km
- 1.19847
- COALNE Coastline 255
- DEPARE Depth area 149
- DEPCNT Depth contour 143
- LNDRGN Land region 126
- SLCONS Shoreline construction 100
- SBDARE Seabed area 35
- RIVERS River 33
- PILPNT 28
- LNDARE Land area 25
- M_QUAL Data quality 18
- SEAARE Sea area 17
- OBSTRN Obstruction 13
- BCNLAT Lateral beacon 10
- BUISGL 10
- DAYMAR 10
- OFSPLF 7
- SOUNDG Sounding 7
- BUAARE 6
- LIGHTS Light 6
- BOYLAT Lateral buoy 5
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/US4MD1CB.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MD1CB/1.0/US4MD1CB.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD1CB/1.0/US4MD1CB.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD1CB/1.0/US4MD1CB.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD1CB/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Apr 2, 2026 | metadata.json |