NOAA S-57 chart cell
Chesapeake Bay - Pocomoke Sound and Big Annemessex River
US4MD1AF
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 4,481
- S-57 layers
- 47
- Published
- Apr 29, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 38.10000° N
- South
- 37.80000° N
- West
- 75.90000° W
- East
- 75.60000° W
- Center
- 37.95000° N, 75.75000° W
- Bounds area
- 256 sq nm
- Feature density
- 17.5152 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 95.3
- Smallest layer
- 1
- Largest layer
- 768
- Area sq km
- 877
- Features per sq km
- 5.10662
- RIVERS River 768
- DEPCNT Depth contour 692
- DEPARE Depth area 686
- COALNE Coastline 634
- LNDRGN Land region 348
- SLCONS Shoreline construction 215
- SBDARE Seabed area 192
- LNDARE Land area 187
- LAKARE 113
- SEAARE Sea area 91
- BCNLAT Lateral beacon 81
- DAYMAR 81
- OBSTRN Obstruction 52
- LIGHTS Light 44
- BUISGL 38
- M_QUAL Data quality 33
- SOUNDG Sounding 29
- BUAARE 19
- WRECKS Wreck 19
- WEDKLP 17
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/US4MD1AF.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4MD1AF/1.1/US4MD1AF.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4MD1AF/1.1/US4MD1AF.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD1AF/1.1/US4MD1AF.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD1AF/1.1/US4MD1AF.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD1AF/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Apr 29, 2026 | metadata.json |