NOAA S-57 chart cell
Chesapeake Bay Smith Point to Cove Point
US4MD20M
- Usage band
- Approach · code 4
- Current edition
- 43.0
- Features
- 2,432
- S-57 layers
- 57
- Published
- Jun 10, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 38.40934° N
- South
- 37.85730° N
- West
- 76.49411° W
- East
- 75.37291° W
- Center
- 38.13332° N, 75.93351° W
- Bounds area
- 1,755 sq nm
- Feature density
- 1.3858 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 42.7
- Smallest layer
- 1
- Largest layer
- 402
- Area sq km
- 6,020
- Features per sq km
- 0.40402
- COALNE Coastline 402
- DEPARE Depth area 215
- DEPCNT Depth contour 215
- SLCONS Shoreline construction 195
- LNDRGN Land region 194
- SBDARE Seabed area 145
- OBSTRN Obstruction 137
- RIVERS River 106
- PILPNT 83
- DAYMAR 76
- LNDARE Land area 70
- LIGHTS Light 64
- BCNLAT Lateral beacon 63
- M_QUAL Data quality 57
- WRECKS Wreck 51
- SEAARE Sea area 40
- LAKARE 33
- CTNARE Caution area 31
- SOUNDG Sounding 26
- BCNSPP Special purpose beacon 25
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/US4MD20M.zip
- S-57 cell https://charts.openships.ai/noaa/s57/approach/US4MD20M/43.0/US4MD20M.000
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD20M/43.0/US4MD20M.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD20M/43.0/US4MD20M.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD20M/43.0/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 43.0 | Jun 10, 2026 | metadata.json |