NOAA S-57 chart cell
Chesapeake Bay - Gunpowder River and Bush River
US4MD1FD
- Usage band
- Approach · code 4
- Current edition
- 1.3
- Features
- 1,332
- S-57 layers
- 45
- Published
- Jun 17, 2026
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 39.60000° N
- South
- 39.30000° N
- West
- 76.50000° W
- East
- 76.20000° W
- Center
- 39.45000° N, 76.35000° W
- Bounds area
- 251 sq nm
- Feature density
- 5.3169 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 29.6
- Smallest layer
- 1
- Largest layer
- 257
- Area sq km
- 859
- Features per sq km
- 1.55015
- COALNE Coastline 257
- LNDRGN Land region 191
- SLCONS Shoreline construction 150
- RIVERS River 125
- DEPARE Depth area 85
- DEPCNT Depth contour 63
- OBSTRN Obstruction 58
- LIGHTS Light 41
- SBDARE Seabed area 33
- PILPNT 32
- SEAARE Sea area 30
- DAYMAR 25
- LNDARE Land area 23
- BCNLAT Lateral beacon 21
- M_QUAL Data quality 19
- LNDMRK 18
- BRIDGE 15
- UWTROC Underwater rock 15
- CBLOHD 14
- WRECKS Wreck 13
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/US4MD1FD.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.001
- S-57 update 002 https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.002
- S-57 update 003 https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.003
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/US4MD1FD.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4MD1FD/1.3/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.3 | Jun 17, 2026 | metadata.json |