NOAA S-57 chart cell
Chesapeake Bay - Cove Point to Hackett Point
US4MD81M
- Usage band
- Approach · code 4
- Current edition
- 35.1
- Features
- 706
- S-57 layers
- 35
- Published
- Jun 17, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 39.05323° N
- South
- 38.34680° N
- West
- 76.62229° W
- East
- 75.99752° W
- Center
- 38.70002° N, 76.30990° W
- Bounds area
- 1,242 sq nm
- Feature density
- 0.5686 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 20.2
- Smallest layer
- 1
- Largest layer
- 216
- Area sq km
- 4,259
- Features per sq km
- 0.16577
- COALNE Coastline 216
- LNDRGN Land region 115
- SLCONS Shoreline construction 57
- DEPARE Depth area 54
- DEPCNT Depth contour 47
- RIVERS River 39
- SEAARE Sea area 27
- LNDARE Land area 18
- PILPNT 16
- CTNARE Caution area 12
- LIGHTS Light 12
- M_QUAL Data quality 11
- LAKARE 10
- BCNLAT Lateral beacon 7
- BOYLAT Lateral buoy 7
- DAYMAR 7
- BUAARE 6
- SBDARE Seabed area 6
- BOYSPP Special purpose buoy 5
- SOUNDG Sounding 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/US4MD81M.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4MD81M/35.1/US4MD81M.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4MD81M/35.1/US4MD81M.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD81M/35.1/US4MD81M.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD81M/35.1/US4MD81M.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD81M/35.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 35.1 | Jun 17, 2026 | metadata.json |