NOAA S-57 chart cell
Patapsco, Magothy, and Severn Rivers
US4MD1EC
- Usage band
- Approach · code 4
- Current edition
- 1.0
- Features
- 691
- S-57 layers
- 32
- Published
- Jul 22, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 39.30000° N
- South
- 39.00000° N
- West
- 76.80000° W
- East
- 76.50000° W
- Center
- 39.15000° N, 76.65000° W
- Bounds area
- 252 sq nm
- Feature density
- 2.7464 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 21.6
- Smallest layer
- 1
- Largest layer
- 308
- Area sq km
- 863
- Features per sq km
- 0.80073
- SLCONS Shoreline construction 308
- COALNE Coastline 68
- BRIDGE 38
- LNDRGN Land region 38
- CBLOHD 35
- SEAARE Sea area 26
- M_QUAL Data quality 22
- BUAARE 19
- FAIRWY Fairway 18
- LNDARE Land area 18
- CTNARE Caution area 11
- LNDMRK 10
- RIVERS River 10
- DEPARE Depth area 9
- LIGHTS Light 9
- SILTNK 9
- LAKARE 7
- RESARE 7
- MAGVAR Magnetic variation 6
- BCNSPP Special purpose beacon 4
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/US4MD1EC.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MD1EC/1.0/US4MD1EC.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD1EC/1.0/US4MD1EC.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD1EC/1.0/US4MD1EC.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD1EC/1.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.0 | Jul 22, 2025 | metadata.json |